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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 3c157fa..961036e 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -2319,7 +2319,7 @@
 /**
  * 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;