ARM: OMAP4: cpuidle - fix static omap4_idle_data declaration

Add the static declaration for the omap4_idle_data variable because its scope
is in the file only.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/cpuidle44xx.c

@@ -33,7 +33,7 @@ struct omap4_idle_statedata {
 
 #define OMAP4_NUM_STATES 3
 
-struct omap4_idle_statedata omap4_idle_data[OMAP4_NUM_STATES];
+static struct omap4_idle_statedata omap4_idle_data[OMAP4_NUM_STATES];
 static struct powerdomain *mpu_pd, *cpu0_pd, *cpu1_pd;
 
 /**