drm/amd/display: Do not clear GPINT register when releasing DMUB from reset

drm/amd/display: Do not clear GPINT register when releasing DMUB from reset

[ Upstream commit 99d92eaca5d915763b240aae24669f5bf3227ecf ]

[Why & How]
There's no need to clear GPINT register for DMUB
when releasing it from reset. Fix that.

Fixes: ac2e555e0a7f ("drm/amd/display: Add DMCUB source files and changes for DCN32/321")
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>