hwc: Return failure from hwc_device_open when fb open fails

- When fb open fails during hwc initialization, it should be
  flagged as a fatal error and HAL should return error.
- Without this, the SF would make calls to HWC that would fail,
  and display being blank.

Change-Id: I20f08bdcb283d4805449c74a8214b871c2f1c80b
4 files changed