ARM: at91: updated the at91_dt_defconfig with support for the ADS7846

This provides touchscreen support to the at91sam9261ek
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@traphandler.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/configs/at91_dt_defconfig

@@ -121,6 +121,7 @@ CONFIG_INPUT_EVDEV=y
 CONFIG_KEYBOARD_GPIO=y
 # CONFIG_INPUT_MOUSE is not set
 CONFIG_INPUT_TOUCHSCREEN=y
+CONFIG_TOUCHSCREEN_ADS7846=y
 # CONFIG_SERIO is not set
 CONFIG_LEGACY_PTY_COUNT=4
 CONFIG_SERIAL_ATMEL=y