drm/amd/display: Add DPCS regs for dcn302 link encoder

dpcs reg are missing for dcn302 link encoder regs list, so add them.
Just like dcn3

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c

@@ -967,6 +967,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		[id] = {\
 				LE_DCN3_REG_LIST(id), \
 				UNIPHY_DCN2_REG_LIST(phyid), \
+				DPCS_DCN2_REG_LIST(id), \
 				SRI(DP_DPHY_INTERNAL_CTRL, DP, id) \
 		}