video: msm: Fix initial state of LCD backlight

* For devices which use the LCD backlight we need to actually call the
* function which sets the brightness after initializing it in the probe.

Change-Id: Id6b7c0de3cd31181394c56c7f6061bca9defd861
Revert "msm: ipc: Allow QMI clients to send messages after IRSC is complete"

Breaks GPS for HTC devices.

This reverts commit d6dbfaeb2f2d964ce6a06ac2cb1c4e6ddf5ff385.

Change-Id: Ifa86b9cb3a1061833c67dffb4bbd5484af5c746c