media: dt-bindings: add bindings document for zx-irdec

It adds the dt-bindings document for ZTE ZX IRDEC remote control
block.

Signed-off-by: Shawn Guo <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Sean Young <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
1 file changed