sdm: don't allow power off until CRTC active

- CRTC set_active done in first commit.
- power on not allowed until first commit.
- so, until first commit is successful don't
  allow power off as well.

Change-Id: I9b5252dbd21aa32531b96d77dbe90b9e3ee0e744
CRs-Fixed: 2396374
2 files changed