drm/framebuffer: Format modifier for Intel Gen 12 render compression with Clear Color

Gen12 display can decompress surfaces compressed by render engine with
Clear Color, add a new modifier as the driver needs to know the surface
was compressed by render engine.

V2: Description changes as suggested by Rafael.
V3: Mention the Clear Color size of 64 bits in the comments(DK)
v4: Fix trailing whitespaces
v5: Explain Clear Color in the documentation.
v6: Documentation Nitpicks(Nanley)

Cc: Ville Syrjala <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Kalyan Kondapally <[email protected]>
Cc: Rafael Antognolli <[email protected]>
Cc: Nanley Chery <[email protected]>
Signed-off-by: Radhakrishna Sripada <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Acked-by: Nanley Chery <[email protected]>
Reviewed-by: Mika Kahola <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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