ARM: OMAP: omap_common_late_init may be unused

Some OMAP SoCs use this function while others do not, and that
causes a warning when building multi_v7_defconfig. Marking the
function __maybe_unused silences the harmless warning without the
need to add complex #ifdef logic.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index fe3253a..4a3f06f 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -394,7 +394,7 @@
 	omap_pm_if_early_init();
 }
 
-static void __init omap_common_late_init(void)
+static void __init __maybe_unused omap_common_late_init(void)
 {
 	omap_mux_late_init();
 	omap2_common_pm_late_init();