ARM: omap2: mark unused functions as __maybe_unused

The omap_generic_init() and omap_hwmod_init_postsetup() functions are
used in the initialization for all OMAP2+ SoC types, but in the
extreme case that those are all disabled, we get a warning about
unused code:

arch/arm/mach-omap2/io.c:412:123: error: 'omap_hwmod_init_postsetup' defined but not used [-Werror=unused-function]
arch/arm/mach-omap2/board-generic.c:30:123: error: 'omap_generic_init' defined but not used [-Werror=unused-function]

This annotates both as __maybe_unused to shut up that warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

arch/arm/mach-omap2/board-generic.c

@@ -28,7 +28,7 @@ static const struct of_device_id omap_dt_match_table[] __initconst = {
 	{ }
 };
 
-static void __init omap_generic_init(void)
+static void __init __maybe_unused omap_generic_init(void)
 {
 	pdata_quirks_init(omap_dt_match_table);
 

arch/arm/mach-omap2/io.c

@@ -410,7 +410,7 @@ static int _set_hwmod_postsetup_state(struct omap_hwmod *oh, void *data)
 	return omap_hwmod_set_postsetup_state(oh, *(u8 *)data);
 }
 
-static void __init omap_hwmod_init_postsetup(void)
+static void __init __maybe_unused omap_hwmod_init_postsetup(void)
 {
 	u8 postsetup_state;