scripts/tags.sh: use `find` for $ALLSOURCE_ARCHS generation

The current code includes 'Kconfig' in ALLSOURCE_ARCHS, but
it should not (Kconfig is not an architecture). Replace this
with a find-generated string and directly assign it to
$ALLSOURCE_ARCHS. The find_all_archs() function is no longer
needed for a one-liner with obvious semantics, so inline the
arch generation into the surrounding conditional.

Signed-off-by: Joey Pabalinas <[e-mail]>
Signed-off-by: Masahiro Yamada <[e-mail]>

scripts/tags.sh

···
 # ignore userspace tools
 ignore="$ignore ( -path ${tree}tools ) -prune -o"
 
-# Find all available archs
-find_all_archs()
-{
-	ALLSOURCE_ARCHS=""
-	for arch in `ls ${tree}arch`; do
-		ALLSOURCE_ARCHS="${ALLSOURCE_ARCHS} "${arch##\/}
-	done
-}
-
 # Detect if ALLSOURCE_ARCHS is set. If not, we assume SRCARCH
 if [ "${ALLSOURCE_ARCHS}" = "" ]; then
 	ALLSOURCE_ARCHS=${SRCARCH}
 elif [ "${ALLSOURCE_ARCHS}" = "all" ]; then
-	find_all_archs
+	ALLSOURCE_ARCHS=$(find ${tree}arch/ -mindepth 1 -maxdepth 1 -type d -printf '%f ')
 fi
 
 # find sources in arch/$ARCH