video: hx8394: Add panel driver for hannstar,hsd060bhw4

The driver is for panels based on the Himax HX8394 controller, such as the
HannStar HSD060BHW4 720x1440 TFT LCD panel that uses a MIPI-DSI interface.
This panel is used in Pinephone Pro.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Cc: Anatolij Gustschin <agust@denx.de>
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