omap2/3/4: gpmc: kill compile warning

Get rid of the following warnings:

arch/arm/mach-omap2/gpmc.c:550:30: warning: non-ANSI
function declaration of function 'omap3_gpmc_save_context'

arch/arm/mach-omap2/gpmc.c:581:33: warning: non-ANSI
function declaration of function 'omap3_gpmc_restore_context'
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/gpmc.c

@@ -552,9 +552,10 @@ void __init gpmc_init(void)
 #ifdef CONFIG_ARCH_OMAP3
 static struct omap3_gpmc_regs gpmc_context;
 
-void omap3_gpmc_save_context()
+void omap3_gpmc_save_context(void)
 {
 	int i;
+
 	gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
 	gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
 	gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
@@ -583,9 +584,10 @@ void omap3_gpmc_save_context()
 	}
 }
 
-void omap3_gpmc_restore_context()
+void omap3_gpmc_restore_context(void)
 {
 	int i;
+
 	gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
 	gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
 	gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);