msm: camera: Do not invalidate one time settings

In the case of stream off and stream on the sensor without
powering down, then retain the one time settings from user.

Change-Id: I86feac3aacd306119a2bdf1ee15dde0743100910
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>