media: rc: add driver for Amlogic Meson IR remote receiver

Amlogic Meson SoCs include a infrared remote control receiver that can
operate in two modes: in "NEC" mode the hardware can decode frames
using the NEC IR protocol, while in "general" mode the receiver simply
reports the duration of pulses and spaces for software decoding.

This is a driver for the IR receiver that uses software decoding of
received frames.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
media: rc: meson: document device tree bindings

This adds binding documentation for the infrared remote control
receiver available in Amlogic Meson SoCs.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
ARM: dts: meson: add dts nodes for IR receiver