drm/i915/dsc: Fill in native_420 field

Now that we have laid the groundwork for YUV420 Enablement
we fill up native_420 field in vdsc_cfg and add appropriate
checks wherever required.

---v2
-adding native_422 field as 0 [Vandita]
-filling in second_line_bpg_offset, second_line_offset_adj
and nsl_bpg_offset in vds_cfg when native_420 is true

---v3
-adding display version check to solve igt issue

--v7
-remove is_pipe_dsc check as its always true for D14 [Jani]

--v10
-keep sink capability check [Jani]
-move from !(x == y  || w == z) to x !=y && w != z [Jani]

--v11
-avoid native_420 computation if not gen14 [Uma]

--v12
-fix state mismatch issue of compressed_bpp

Cc: Uma Shankar <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Suraj Kandpal <[email protected]>
Reviewed-by: Uma Shankar <[email protected]>
Signed-off-by: Uma Shankar <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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