fix the version generation in u-boot

Summary:
u-boot has its copy to get the OpenBMC version and put it to
.scmversion. That logic is broken after OpenBMC restructuring. The diff
removes the dup copy and use the newly introduced OPENBMC_VERSION
variable for that.

Test Plan:
bitbake u-boot
and then verify .scmversion is updated correctly.

Reviewed By: benwei13

fbshipit-source-id: 3f325d8

meta-aspeed/recipes-bsp/u-boot/u-boot_2016.07.bb

@@ -92,36 +92,12 @@ do_compile () {
     unset CFLAGS
     unset CPPFLAGS
 
-    # found out the source dir
-    dir=$(pwd)
-    while [ -n "$dir" -a "$dir" != "/" -a ! -d "$dir/meta-openbmc/.git" ]; do
-        dir=$(dirname $dir)
-    done
-
-    if [ -d "$dir/meta-openbmc/.git" ]; then
-        srcdir="$dir/meta-openbmc"
-        srcdir_git="${srcdir}/.git"
-        version=$(git --git-dir=${srcdir_git} --work-tree=${srcdir} describe --tags --dirty --always 2> /dev/null)
-    else
-        version=""
-    fi
-
-    print_version="${MACHINE}"
-    if [[ $version == ${MACHINE}-v* ]]; then
-      print_version=" ${version} "
-    elif [[ $version == "" ]]; then
-      print_version=" ${MACHINE}-v0.0 "
-    else
-      sha=$(git --git-dir=${srcdir_git} --work-tree=${srcdir} rev-parse --short HEAD 2> /dev/null)
-      print_version=" ${MACHINE}-${sha} "
-    fi
-
     if [ ! -e ${B}/.scmversion -a ! -e ${S}/.scmversion ]
     then
         echo ${UBOOT_LOCALVERSION} > ${B}/.scmversion
-        echo ${print_version} >> ${B}/.scmversion
+        echo ${OPENBMC_VERSION} >> ${B}/.scmversion
         echo ${UBOOT_LOCALVERSION} > ${S}/.scmversion
-        echo ${print_version} >> ${S}/.scmversion
+        echo ${OPENBMC_VERSION} >> ${S}/.scmversion
     fi
 
     if [ "x${UBOOT_CONFIG}" != "x" ]