kirkwood: make MPP arrays static const

This saves stack and code memory for local copy, and
consumes initialized data memory. For 22 of the 29
kirkwood-based boards, this results in a global saving
of about 30 bytes. For 7 of them, it results in an
increase of 6 to 14 bytes.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/board/buffalo/lsxl/lsxl.c b/board/buffalo/lsxl/lsxl.c
index 57776fb..f298020 100644
--- a/board/buffalo/lsxl/lsxl.c
+++ b/board/buffalo/lsxl/lsxl.c
@@ -76,7 +76,7 @@
 	 * Multi-Purpose Pins Functionality configuration
 	 * These strappings are taken from the original vendor uboot port.
 	 */
-	u32 kwmpp_config[] = {
+	static const u32 kwmpp_config[] = {
 		MPP0_SPI_SCn,
 		MPP1_SPI_MOSI,
 		MPP2_SPI_SCK,