Add a matrix keyboard on I2C
See: https://github.com/raspberrypi/linux/pull/4700
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
+CONFIG_KEYBOARD_TCA6416=m
CONFIG_KEYBOARD_TCA8418=m
CONFIG_KEYBOARD_MATRIX=m
CONFIG_KEYBOARD_CAP11XX=m
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
+CONFIG_KEYBOARD_TCA6416=m
CONFIG_KEYBOARD_TCA8418=m
CONFIG_KEYBOARD_MATRIX=m
CONFIG_KEYBOARD_CAP11XX=m
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
+CONFIG_KEYBOARD_TCA6416=m
CONFIG_KEYBOARD_TCA8418=m
CONFIG_KEYBOARD_MATRIX=m
CONFIG_KEYBOARD_CAP11XX=m
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
+CONFIG_KEYBOARD_TCA6416=m
CONFIG_KEYBOARD_TCA8418=m
CONFIG_KEYBOARD_MATRIX=m
CONFIG_KEYBOARD_CAP11XX=m
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
+CONFIG_KEYBOARD_TCA6416=m
CONFIG_KEYBOARD_TCA8418=m
CONFIG_KEYBOARD_MATRIX=m
CONFIG_KEYBOARD_CAP11XX=m