board_status: use command -v over which(1)

The script is pretty linux specific as-is, but more portability won't hurt.

Change-Id: I33e18606bea4e23043d748e3fe66a345e720d389
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/11151
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

util/board_status/board_status.sh

@@ -38,10 +38,10 @@ test_cmd()
 	fi
 
 	if [ "$1" -eq "$REMOTE" ] && [ -n "$REMOTE_HOST" ]; then
-		ssh root@${REMOTE_HOST} which "$2" > /dev/null
+		ssh root@${REMOTE_HOST} command -v "$2" > /dev/null
 		rc=$?
 	else
-		which "$2" >/dev/null
+		command -v "$2" >/dev/null
 		rc=$?
 	fi