phy: amlogic: Add G12A Analog MIPI D-PHY driver

The Amlogic G12A SoCs embeds an Analog MIPI D-PHY used to communicate with DSI
panels.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220705075650.3165348-3-narmstrong@baylibre.com


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