mtd: maps: add const qualifiers

Be a bit stricter and add few more 'const' qualifiers.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/maps/sa1100-flash.c b/drivers/mtd/maps/sa1100-flash.c
index f694417..29e3dca 100644
--- a/drivers/mtd/maps/sa1100-flash.c
+++ b/drivers/mtd/maps/sa1100-flash.c
@@ -244,7 +244,7 @@
 	return ERR_PTR(ret);
 }
 
-static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
+static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL };
 
 static int sa1100_mtd_probe(struct platform_device *pdev)
 {