omap2/3/4: gpmc: avoid section definitions on headers

trivial patch, no functional changes.
Signed-off-by: NFelipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/gpmc.h

@@ -110,6 +110,6 @@ extern void gpmc_prefetch_reset(void);
 extern int gpmc_prefetch_status(void);
 extern void omap3_gpmc_save_context(void);
 extern void omap3_gpmc_restore_context(void);
-extern void __init gpmc_init(void);
+extern void gpmc_init(void);
 
 #endif