arm64: dts: meson-gxbb-odroid-c2: add rc-odroid ir keymap

Add the rc-odroid keymap to the Odroid C2 device-tree.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/1582213085-11656-1-git-send-email-christianshewitt@gmail.com