drm/amd/display: drop unused dm_delay_in_microseconds

No longer used.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-10-11 12:44:13 -04:00 • committed by Dave Airlie
commit d7205d5c0f