ARM: shmobile: defconfig: Enable DA9063 ONKEY support

Enable support for the "ONKEY" of the Dialog DA9063 PMIC, which is used
on the Stout and Silk boards.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200624131931.3686-3-geert+renesas@glider.be

arch/arm/configs/shmobile_defconfig

@@ -65,6 +65,7 @@ CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_EDT_FT5X06=y
 CONFIG_TOUCHSCREEN_ST1232=y
 CONFIG_INPUT_MISC=y
+CONFIG_INPUT_DA9063_ONKEY=y
 CONFIG_INPUT_ADXL34X=y
 # CONFIG_LEGACY_PTYS is not set
 CONFIG_SERIAL_8250=y