drm/msm: Add missing stub definition

[ Upstream commit a0b21e0ad29420b04911a98d360b9586168eeae5 ]

DRM_MSM fails to build with DRM_MSM_DP=n; add the missing stub.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
1 file changed