drm/fourcc: Introduce format modifiers for DG2 render and media compression

The render/media engines on DG2 unify render compression and media
compression into a single format for the first time, using the Tile 4
layout for main surfaces. The compression algorithm is different from
any previous platform and the display engine must still be configured to
decompress either a render or media compressed surface; as such, we
need new RC and MC framebuffer modifiers to represent buffers in this
format.

v2: Clarify modifier layout description.

Cc: [email protected]
Signed-off-by: Matt Roper <[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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