ARM: omap2plus_defconfig: Enable pcf857x

We have pcf857x at least several boards. Let's enable it
as a loadable module.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig
index 6ed7799..6654b23 100644
--- a/arch/arm/configs/omap2plus_defconfig
+++ b/arch/arm/configs/omap2plus_defconfig
@@ -207,6 +207,7 @@
 CONFIG_PINCTRL_SINGLE=y
 CONFIG_DEBUG_GPIO=y
 CONFIG_GPIO_SYSFS=y
+CONFIG_GPIO_PCF857X=m
 CONFIG_GPIO_TWL4030=y
 CONFIG_W1=m
 CONFIG_HDQ_MASTER_OMAP=m