ARM: make arrays containing machine compatible strings const

The definition

	static const char *axxia_dt_match[] __initconst = {
		...

defines a changable array of constant strings. That is you must not do:

	*axxia_dt_match[0] = 'k';

but

	axxia_dt_match[0] = "different string";

is fine. So the annotation __initconst is wrong and yields a compiler
error when other really const variables are added with __initconst.

As the struct machine_desc member dt_compat is declared as

	const char *const *dt_compat;

making the arrays const is the better alternative over changing all
annotations to __initdata.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-prima2/common.c

@@ -21,7 +21,7 @@ static void __init sirfsoc_init_late(void)
 }
 
 #ifdef CONFIG_ARCH_ATLAS6
-static const char *atlas6_dt_match[] __initconst = {
+static const char *const atlas6_dt_match[] __initconst = {
 	"sirf,atlas6",
 	NULL
 };
@@ -36,7 +36,7 @@ MACHINE_END
 #endif
 
 #ifdef CONFIG_ARCH_PRIMA2
-static const char *prima2_dt_match[] __initconst = {
+static const char *const prima2_dt_match[] __initconst = {
 	"sirf,prima2",
 	NULL
 };
@@ -52,7 +52,7 @@ MACHINE_END
 #endif
 
 #ifdef CONFIG_ARCH_ATLAS7
-static const char *atlas7_dt_match[] __initdata = {
+static const char *const atlas7_dt_match[] __initconst = {
 	"sirf,atlas7",
 	NULL
 };