imx8/ls10xx: Use a sane SYS_MALLOC_F_LEN default

When adding new features to imx8m boards, such as DM clock support,
the malloc area can be exhausted.

To avoid such issue, provide a reasonable default for the
SYS_MALLOC_F_LEN size.

Quoting Tom Rini:

"This seems to be an area where everyone is either:
- Kicking the value up a bit for themselves
- Having hard to figure out problems booting the platform because it's
  too small a value until they see someone else picked a larger value.

So lets raise these a bit and get some acks, please."

Suggested-by: Heinrich Schuchardt <[email protected]>
Signed-off-by: Fabio Estevam <[email protected]>
Tested-by: Adam Ford <[email protected]> #imx8mm-beacon, imx8mn-beacon
Tested-by: Heiko Thiery <[email protected]>

Kconfig

@@ -249,10 +249,10 @@ config SYS_MALLOC_F_LEN
 	depends on SYS_MALLOC_F
 	default 0x1000 if AM33XX
 	default 0x4000 if SANDBOX || RISCV
-	default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
-			   ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
-			   ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
-			   ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
+	default 0x2000 if (ARCH_MX7 || ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
+			   ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
+	default 0x10000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_LS1012A || \
+			    ARCH_LS1021A || ARCH_LS1043A || ARCH_LS1046A)
 	default 0x400
 	help
 	  Before relocation, memory is very limited on many platforms. Still,