drm/amd/display: cleaned up coding error in init_hw

drm/amd/display: cleaned up coding error in init_hw

[why]
during a refactor a redundant code that has unknown behaviour was added.

[how]
removed old bad code

Fixes: cf968bb3a4bf ("drm/amd/display: Make init_hw and init_pipes generic for seamless boot")
Signed-off-by: Martin Leung <martin.leung@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>