drm: add modifiers for MediaTek tiled formats

MediaTek (MTK) uses some unique tiled memory formats
for video decoding. Add these to the uapi drm_fourcc.h
so that we can use them in Mesa, GStreamer, and other
tools/libraries.

v2:
- Classify the modifier bits into categories and provide
  room for expansion (Daniel S.)

Signed-off-by: Eric R. Smith <eric.smith@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241219174929.126205-1-eric.smith@collabora.com


Signed-off-by: Daniel Stone <daniels@collabora.com>