arm64: defconfig: Enable Atmel Maxtouch driver

Enable the Atmel Maxtouch driver to support the touchscreen
and touchpad present in RK3399 Kevin Chromebooks.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/configs/defconfig

@@ -253,6 +253,8 @@ CONFIG_INPUT_EVDEV=y
 CONFIG_KEYBOARD_ADC=m
 CONFIG_KEYBOARD_CROS_EC=y
 CONFIG_KEYBOARD_GPIO=y
+CONFIG_INPUT_TOUCHSCREEN=y
+CONFIG_TOUCHSCREEN_ATMEL_MXT=m
 CONFIG_INPUT_MISC=y
 CONFIG_INPUT_PM8941_PWRKEY=y
 CONFIG_INPUT_HISI_POWERKEY=y