drm/amd/display: Drop unused registers

[Why & How]
Some registers are never used in the driver
but defined. Remove them.
Reviewed-by: Roman Li <roman.li@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_hubbub.h

@@ -37,8 +37,6 @@
 	SR(DCHUBBUB_ARB_SAT_LEVEL),\
 	SR(DCHUBBUB_ARB_DF_REQ_OUTSTAND),\
 	SR(DCHUBBUB_GLOBAL_TIMER_CNTL), \
-	SR(DCHUBBUB_TEST_DEBUG_INDEX), \
-	SR(DCHUBBUB_TEST_DEBUG_DATA),\
 	SR(DCHUBBUB_SOFT_RESET),\
 	SR(DCHUBBUB_CRC_CTRL), \
 	SR(DCN_VM_FB_LOCATION_BASE),\