drm/amd/display: update dcn21 hubbub registers
use dcn20 common regs define to share some regs with dcn20 Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Reviewed-by: Roman Li <Roman.Li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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