ARM: mxs_defconfig: Build CONFIG_INPUT_EVDEV as built-in

Build CONFIG_INPUT_EVDEV as a built-in driver, as it makes easier to test
the LRADC touchscreen driver, for example, by using the 'evtest' tool.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/mxs_defconfig

@@ -75,7 +75,7 @@ CONFIG_REALTEK_PHY=y
 CONFIG_MICREL_PHY=y
 # CONFIG_WLAN is not set
 # CONFIG_INPUT_MOUSEDEV_PSAUX is not set
-CONFIG_INPUT_EVDEV=m
+CONFIG_INPUT_EVDEV=y
 # CONFIG_INPUT_KEYBOARD is not set
 # CONFIG_INPUT_MOUSE is not set
 CONFIG_INPUT_TOUCHSCREEN=y