ARM: appropriate __init annotation for const data

Init data marked const should be annotated with __initconst for
correctness and not __initdata.  In some cases the array gathering
references to that data has to be marked const as well. This fixes
LTO builds that otherwise fail with section mismatch errors.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-shmobile/setup-r8a7791.c

@@ -23,7 +23,7 @@
 #include "r8a7791.h"
 #include "rcar-gen2.h"
 
-static const char *r8a7791_boards_compat_dt[] __initdata = {
+static const char *const r8a7791_boards_compat_dt[] __initconst = {
 	"renesas,r8a7791",
 	NULL,
 };