drm/panel: simple: Add Innolux AT056tN53V1 5.6" VGA

commit  09b3c074cad524316e864096a075eeca79093ebe from
https://github.com/raspberrypi/linux.git

 rpi-6.1.y

Add support for the Innolux AT056tN53V1 5.6" VGA (640x480) TFT LCD
panel.

Signed-off-by: Joerg Quinten <aBUGSworstnightmare@gmail.com>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>