Remove default variant from raspi-2 and EG builders. (#5107)

We should rely on SB specific variants and to avoid confusion do away
with default variants.
    
 b/404612333

Author: isarkis

.github/config/evergreen-arm-hardfp.json

@@ -11,21 +11,11 @@
     ]
   },
   "platforms": [
-    "evergreen-arm-hardfp",
     "evergreen-arm-hardfp-sbversion-14",
     "evergreen-arm-hardfp-sbversion-15",
     "evergreen-arm-hardfp-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"hardfp",
-      "platform":"evergreen-arm-hardfp",
-      "target_platform":"evergreen-arm-hardfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "evergreen_loader_extra_gn_arguments": "use_asan=false is_clang=false",
-      "dimension": "release_version=regex:10.*"
-    },
     {
       "name":"sbversion-14",
       "platform":"evergreen-arm-hardfp-sbversion-14",

.github/config/evergreen-arm-softfp.json

@@ -11,20 +11,11 @@
     ]
   },
   "platforms": [
-    "evergreen-arm-softfp",
     "evergreen-arm-softfp-sbversion-14",
     "evergreen-arm-softfp-sbversion-15",
     "evergreen-arm-softfp-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"softfp",
-      "platform":"evergreen-arm-softfp",
-      "target_platform":"evergreen-arm-softfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
     {
       "name":"sbversion-14",
       "platform":"evergreen-arm-softfp-sbversion-14",

.github/config/evergreen-arm64.json

@@ -2,20 +2,11 @@
   "docker_service": "build-android-evergreen",
   "evergreen_loader": "android-arm64",
   "platforms": [
-    "evergreen-arm64",
     "evergreen-arm64-sbversion-14",
     "evergreen-arm64-sbversion-15",
     "evergreen-arm64-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"arm64",
-      "platform":"evergreen-arm64",
-      "target_platform":"evergreen-arm64",
-      "target_cpu":"target_cpu=\\\"arm64\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
     {
       "name":"sbversion-14",
       "platform":"evergreen-arm64-sbversion-14",

.github/config/evergreen-x64.json

@@ -4,19 +4,11 @@
   "evergreen_loader": "linux-x64x11",
   "on_host_test_shards": ["0", "1", "2", "3", "blackbox", "wpt"],
   "platforms": [
-    "evergreen-x64",
     "evergreen-x64-sbversion-14",
     "evergreen-x64-sbversion-15",
     "evergreen-x64-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"x64",
-      "platform":"evergreen-x64",
-      "target_platform":"evergreen-x64",
-      "target_cpu":"target_cpu=\\\"x64\\\"",
-      "extra_gn_arguments":"use_asan=false"
-    },
     {
       "name":"sbversion-14",
       "platform":"evergreen-x64-sbversion-14",

.github/config/linux.json

@@ -4,19 +4,13 @@
   "on_host_test": true,
   "on_host_test_shards": ["0", "1", "2", "3", "blackbox", "wpt"],
   "platforms": [
-    "linux-x64x11",
     "linux-x64x11-egl",
     "linux-x64x11-skia",
     "linux-x64x11-sbversion-14",
     "linux-x64x11-sbversion-15",
     "linux-x64x11-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"x64",
-      "platform":"linux-x64x11",
-      "target_platform":"linux-x64x11"
-    },
     {
       "name":"egl",
       "platform":"linux-x64x11-egl",

.github/config/raspi-2.json

@@ -12,19 +12,10 @@
     ]
   },
   "platforms": [
-    "raspi-2",
     "raspi-2-sbversion-15",
     "raspi-2-sbversion-16"
   ],
   "includes": [
-    {
-      "name":"raspi",
-      "platform":"raspi-2",
-      "target_platform":"raspi-2",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments": "build_with_separate_cobalt_toolchain=true use_asan=false",
-      "dimension": "release_version=regex:10.*"
-    },
     {
       "name":"sbversion-15",
       "platform":"raspi-2-sbversion-15",