dt-bindings: display: panel: Add WL-355608-A8 panel

The WL-355608-A8 is a 3.5" 640x480@60Hz RGB LCD display used in a
number of handheld gaming devices made by Anbernic. By consensus a
vendor prefix is not provided as the panel OEM is unknown.

Add a device tree binding for the panel.

Signed-off-by: Ryan Walklin <ryan@testtoast.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240530211415.44201-3-ryan@testtoast.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240530211415.44201-3-ryan@testtoast.com