[ Upstream commit 4d0a72b6 ]

Only send non-0 clocks to DC for validation.  This mirrors
what the windows driver does.

Bug: https://gitlab.freedesktop.org/drm/amd/issues/963Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>