u-boot-aspeed: Disable unnecessary features

Allow platforms to opt into the u-boot patch disabling unnecessary
hardware features for ASPEED SoCs.

As this change touches bits that were not initialised by previous u-boot
revisions and the configuration applied prevents poweron of OpenPOWER
hosts without corresponding host firmware changes, this change is
nohwci.

Change-Id: I0248de6882fff0f6bd00a859bb9c2883969831fc
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/aspeed-layer/recipes-bsp/u-boot/u-boot-aspeed.inc b/aspeed-layer/recipes-bsp/u-boot/u-boot-aspeed.inc
index 5286c1b..bc81be1 100644
--- a/aspeed-layer/recipes-bsp/u-boot/u-boot-aspeed.inc
+++ b/aspeed-layer/recipes-bsp/u-boot/u-boot-aspeed.inc
@@ -9,6 +9,10 @@
     file://0005-config-ast-common-Fall-back-to-secondary-flash-on-fa.patch \
     "
 
+SRC_URI_append_aspeed_df-isolate-bmc = " \
+    file://0001-aspeed-Disable-unnecessary-features.patch \
+    "
+
 do_patch[depends] += "os-release:do_populate_sysroot"
 
 python do_patch_append_aspeed_df-obmc-ubi-fs () {