add digilent uboot submodule

DLX4 · DLX4 · commit c135067bb50d · 2016-06-01T11:27:59.000+08:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "linux-digilent/linux-digilent"]
 	path = linux-digilent/linux-digilent
 	url = git@github.com:Digilent/linux-digilent.git
+[submodule "u-boot-digilent/u-boot-digilent"]
+	path = u-boot-digilent/u-boot-digilent
+	url = git@github.com:Digilent/u-boot-digilent.git
diff --git a/u-boot-digilent/u-boot-digilent b/u-boot-digilent/u-boot-digilent
@@ -0,0 +1 @@
+Subproject commit 4dd0f06c46085cacc607dabbdf288bef6ad67115
