dt-bindings: phy: add Amlogic G12A Analog MIPI D-PHY bindings

The Amlogic G12A SoCs embeds an Analog MIPI D-PHY to communicate with DSI
panels, this adds the bindings.

This Analog D-PHY works with a separate Digital MIPI D-PHY.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220705075650.3165348-2-narmstrong@baylibre.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>