plat-nomadik: set altfunc to GPIO when enabling the sleep config

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index cc9de59..bf299cf 100644
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -175,6 +175,8 @@
 		int slpm_output = PIN_SLPM_DIR(cfg);
 		int slpm_val = PIN_SLPM_VAL(cfg);
 
+		af = NMK_GPIO_ALT_GPIO;
+
 		/*
 		 * The SLPM_* values are normal values + 1 to allow zero to
 		 * mean "same as normal".