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-keystone/keystone.c

@@ -103,7 +103,7 @@ static void __init keystone_init_meminfo(void)
 	pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
 }
 
-static const char *keystone_match[] __initconst = {
+static const char *const keystone_match[] __initconst = {
 	"ti,keystone",
 	NULL,
 };