mfd: db8500-prcmu: Use ANSI function declaration

Silences the following warning:
drivers/mfd/db8500-prcmu.c:2322:25: warning:
non-ANSI function declaration of function 'prcmu_ac_sleep_req'
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/db8500-prcmu.c

@@ -2319,7 +2319,7 @@ int prcmu_ac_wake_req(void)
 /**
  * prcmu_ac_sleep_req - called when ARM no longer needs to talk to modem
  */
-void prcmu_ac_sleep_req()
+void prcmu_ac_sleep_req(void)
 {
 	u32 val;