fixup! Convert flashrom to git

- make version string generation independent of the actual VCS
   used by not generating "unknown" in the makefile but letting
   getrevision do that
 - make hook installation independent of version string generation
   since they have nothing to do with each other and there are no
   synergies anymore

Change-Id: Iedc9df4c033a70447b8b1b65c83764c769b02c3f
Signed-off-by: Stefan Tauner <stefan.tauner@gmx.at>
Reviewed-on: https://review.coreboot.org/21827
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

util/getrevision.sh

@@ -131,13 +131,14 @@ timestamp() {
 
 # Retrieve local revision info.
 local_revision() {
+	local r
 	if git_is_file_tracked "$1" ; then
-		local r=$(git describe $(git_last_commit "$1"))
+		r=$(git describe $(git_last_commit "$1"))
 		if git_has_local_changes "$1" ; then
 			r="$r-dirty"
 		fi
 	else
-		return ${EXIT_FAILURE}
+		r="unknown"
 	fi
 
 	echo "${r}"