arm64: dts: rockchip: Add Hugsun X99 IR receiver

Add the IR receiver and its associated pinctrl entry.

Tested with LibreElec linux-next-20200305

Signed-off-by: Vivek Unune <npcomplete13@gmail.com>
Link: https://lore.kernel.org/r/20200313230513.123049-1-npcomplete13@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>