i9500: overlay: Opt-out of threaded camera startup

Our HAL appears to be broken and we cannot take advantage of the
faster camera startup mode.

Change-Id: Ib50e8b3f15f7845c6e4526172dbaefb81676ee3e
Merge pull request #60 from CyanogenMod/cm-11.0

i9500: overlay: Opt-out of threaded camera startup