dt-bindings: rtc: Convert Amlogic Meson vrtc controller binding

Convert Amlogic Meson vrtc controller binding to yaml.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/d820d54b-d082-589a-621f-2795d885696a@gmail.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>