drm/amd/display: Don't call amdgpu_dm_display_resume as it doesn't exist

amdgpu_dm_display_resume was merged into dm_resume.
No need to call these functions separately.

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>