ARM: dts: sun8i: h3: nanopi-m1-plus: Enable IR controller

The Nanopi M1 Plus has an onboard IR receiver.
This enables the onboard IR receiver subnode.

Signed-off-by: Philipp Rossak <embed3d@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>