drm/panel: ili9341: Remove duplicate code

Remove duplicate code that is handled by tinyDRM,
i.e. drivers/gpu/drm/tiny/ili9341.c.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240813091258.1625646-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Maxime Ripard <mripard@kernel.org>