drm/fourcc: Introduce format modifier for DG2 clear color

DG2 clear color render compression uses Tile4 layout. Therefore, we need
to define a new format modifier for uAPI to support clear color rendering.

v2:
  Display version is fixed. [Imre]
  KDoc is enhanced for cc modifier. [Nanley & Lionel]
v3:
  Split out the modifier addition to a separate patch.
  Clarify the modifier layout description.

Cc: [email protected]
Signed-off-by: Mika Kahola <[email protected]>
cc: Anshuman Gupta <[email protected]>
Signed-off-by: Juha-Pekka Heikkilä <[email protected]>
Signed-off-by: Ramalingam C <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Acked-by: Nanley Chery <[email protected]>
Reviewed-by: Juha-Pekka Heikkila <[email protected]>
Acked-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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