drm/panel: ilitek-ili9881d: add support for Wanchanglong W552946ABA panel

W552946ABA is a panel by Wanchanglong. This panel utilizes the
Ilitek ILI9881D controller.

Add this panel's initialzation sequence and timing to ILI9881D driver.
Tested on px30-evb v11

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211016102232.202119-3-michael@amarulasolutions.com