drm/amd/display: Revert "Add DPP & HUBP reset if power gate enabled on DCN314"

This reverts commit 99e25e46.

[Why & How]
This commit caused a blank screen on internal display when projecting to
an external display on DCN314.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>