msm: HTC: 8960: clean up regulator references

Change-Id: I85dfb1a561690404147d317abbf6c505c22755c6
msm: HTC: 8960: clean up panel debugging

* Use pr_err, pr_info
* Due to the way the backlight works, the backlight debugging is very
  noisy, remove it.

Change-Id: I353213a972ba4daf73f8d19af963eeed74db1aac
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2