ANDROID: update the kernel release format for GKI

The new kernel release format is: w.x.y-zz-k where,
  w.x.y are the current values
  zzz is the Android Release value
  k is the KMI Generation number

This allows one to identify the kernel module interface version using
`uname -r`. The KMI Generation number is used to identify any KMI
changes that occur after the KMI freeze. This should only occur in an
unlikely event that a security patch requires a KMI update.

Here is a local example:
  5.4.51-android12-0-00153-ga972f59040e4-dirty

Signed-off-by: Will McVicker <willmcvicker@google.com>
Bug: 159842160
Change-Id: I33f40e424ca967b85d810cdb12c6a2c58e4197b7
[willmcvicker: squash with commit 0c0d417747d8e289b2808c3fca32c845f82fd5e5]

scripts/setlocalversion

@@ -11,12 +11,14 @@
 #
 
 usage() {
-	echo "Usage: $0 [--save-scmversion] [srctree]" >&2
+	echo "Usage: $0 [--save-scmversion] [srctree] [branch] [kmi-generation]" >&2
 	exit 1
 }
 
 scm_only=false
 srctree=.
+android_release=
+kmi_generation=
 if test "$1" = "--save-scmversion"; then
 	scm_only=true
 	shift
@@ -25,6 +27,24 @@ if test $# -gt 0; then
 	srctree=$1
 	shift
 fi
+if test $# -gt 0; then
+	# Extract the Android release version. If there is no match, then return 255
+	# and clear the var $android_release
+	android_release=`echo "$1" | sed -e '/android[0-9]\{2,\}/!{q255}; \
+		s/^\(android[0-9]\{2,\}\)-.*/\1/'`
+	if test $? -ne 0; then
+		android_release=
+	fi
+	shift
+
+	if test $# -gt 0; then
+		kmi_generation=$1
+		[ $(expr $kmi_generation : '^[0-9]\+$') -eq 0 ] && usage
+		shift
+	else
+		usage
+	fi
+fi
 if test $# -gt 0 -o ! -d "$srctree"; then
 	usage
 fi
@@ -47,6 +67,10 @@ scm_version()
 	if test -z "$(git rev-parse --show-cdup 2>/dev/null)" &&
 	   head=$(git rev-parse --verify --short HEAD 2>/dev/null); then
 
+		if [ -n "$android_release" ] && [ -n "$kmi_generation" ]; then
+			printf '%s' "-$android_release-$kmi_generation"
+		fi
+
 		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
 		# it, because this version is defined in the top level Makefile.
 		if [ -z "$(git describe --exact-match 2>/dev/null)" ]; then