dt-bindings: leds: Document "rc-feedback" trigger

Document the "rc-feedback" trigger which is used to control LEDs by
remote control device activity. This is an existing trigger used in
existing DTs, document it so validation of those DTs would pass.

It was originally introduced into the Linux kernel in 2013 with
commit 153a60b ("[media] rc: add feedback led trigger for rc keypresses")

Signed-off-by: Heiko Stuebner <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: mmind

Documentation/devicetree/bindings/leds/common.yaml

@@ -118,6 +118,8 @@ properties:
             # No trigger assigned to the LED. This is the default mode
             # if trigger is absent
           - none
+            # LED indicates remote control feedback
+          - rc-feedback
             # LED indicates camera torch state
           - torch
             # LED indicates USB gadget activity