u-boot-ti: Change from UBOOT_LOCALVERSION and SRCPV

Stop using UBOOT_LOCALVERSION, and copy what is done in the kernel recipe.  This
allows us to set the correct SHA into the version string even if AUTOREV is used
since SRCPV is no longer set in oe-core.

Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/recipes-bsp/u-boot/u-boot-ti.inc

@@ -1,6 +1,9 @@
-# UBOOT_LOCALVERSION can be set to add a tag to the end of the
-# U-boot version string.  such as the commit id
-UBOOT_LOCALVERSION = "-g${@d.getVar('SRCPV', True).replace('AUTOINC+','')[:10]}"
+do_compile:prepend () {
+    scm_version=$(printf '%s%s' -ti-g $(git -C ${S} rev-parse --verify HEAD 2>/dev/null | cut -c1-12))
+
+    echo ${scm_version} > ${B}/.scmversion
+    echo ${scm_version} > ${S}/.scmversion
+}
 
 UBOOT_SUFFIX ?= "img"
 SPL_BINARY ?= "MLO"