powerpc: Use static const char arrays

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index b1e5611..349b553 100644
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -20,7 +20,7 @@
 #include <string.h>
 
 /* CHRP note section */
-char arch[] = "PowerPC";
+static const char arch[] = "PowerPC";
 
 #define N_DESCR	6
 unsigned int descr[N_DESCR] = {
@@ -33,7 +33,7 @@
 };
 
 /* RPA note section */
-char rpaname[] = "IBM,RPA-Client-Config";
+static const char rpaname[] = "IBM,RPA-Client-Config";
 
 /*
  * Note: setting ignore_my_client_config *should* mean that OF ignores