drm/amd/display: Handle GFX10_RBPLUS modifiers for dcc_ind_blk

Adds the missing logic to set the correct value of dcc_ind_blk for this tiling version.

Signed-off-by: Joshua Ashton <joshua@froggi.es>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>