fbdev: omapfb: panel-sony-acx565akm: remove support for platform data

There are no users of panel_acx565akm_platform_data in the mainline
kernel so support for it can be removed from the panel driver.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>