drm/panel: simple: Simplify matching using of_device_get_match_data()

Both the patform_driver and mipi_dsi_driver structures contain pointers
to the match table used, so the custom code to obtain match and match
data can be replaced by calls to of_device_get_match_data().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/64ded5b7e809e4c6e915b2c4d8b82e02319cd206.1690535800.git.geert+renesas@glider.be