drm/amdgpu/display: fix 64 bit divide

Use proper helper for 32 bit.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-09-20 15:13:24 -05:00
commit 0b36603c0d