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/keymile/km_arm/km_arm.c b/board/keymile/km_arm/km_arm.c
index 262b8d2..eda9199 100644
--- a/board/keymile/km_arm/km_arm.c
+++ b/board/keymile/km_arm/km_arm.c
@@ -54,7 +54,7 @@
 #define MASK_RBI_DEFECT_16	0x01
 
 /* Multi-Purpose Pins Functionality configuration */
-u32 kwmpp_config[] = {
+static const u32 kwmpp_config[] = {
 	MPP0_NF_IO2,
 	MPP1_NF_IO3,
 	MPP2_NF_IO4,