u-boot-aspeed: Generate default env for eMMC

Generate a default environment to boot an eMMC based on a txt
file. Populate the generated environment image into the eMMC.

(From meta-aspeed rev: fdc603c73b2dc8851ce2d1684e9c71a5ce51a5b8)

Change-Id: I93944b183b7907202b02854e931593d62603ae77
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-aspeed/conf/machine/include/aspeed.inc b/meta-aspeed/conf/machine/include/aspeed.inc
index c3c5f18..046553b 100644
--- a/meta-aspeed/conf/machine/include/aspeed.inc
+++ b/meta-aspeed/conf/machine/include/aspeed.inc
@@ -14,7 +14,10 @@
 INITRAMFS_FSTYPES ?= "cpio.xz"
 
 WKS_FILE ?= "emmc-aspeed.wks.in"
-WKS_FILE_DEPENDS ?= "virtual/kernel"
+WKS_FILE_DEPENDS ?= " \
+    virtual/bootloader \
+    virtual/kernel \
+"
 WKS_HOSTFW_SIZE ?= "5G"
 IMAGE_BOOT_FILES ?= "fitImage-${INITRAMFS_IMAGE}-${MACHINE}-${MACHINE};fitImage"