msm8960: fix samsung camcorder mode the right way

A lot of these modes are inter-dependent. Don't mess with Samsung camera
mode if it's already been set.

There is also a problem with apps which use the FFC for video chat, that
don't set the recording hint properly. Detect them from the special
video frame rate used.

Change-Id: I8f1fc611a2f100d0438447c25103fc44917c5d87