Notification long press fix

Change-Id: I3568f249409ac0a0b7f38c4242a7271bc6e79fe1
Move 'start music player on headset connection' option out of DSPManager
(1/2)

This option isn't related to DSP manager at all, so it shouldn't be
implemented there.

Change-Id: Ibe35c9739ccb4f4587ee71f514d16fb317bf4034
Revert "platform: Remove mapping of android.permission.CAMERA to camera group"

This reverts commit de1e404d570dd03529c1e4e8ffbbce432e8be4a2.

Change-Id: Ibc62cb0fc9992e6676ed2af9f1718d28257f65d0
PreferenceDrawerActivity: Customize back button behavior

Patch Set 1:
* This will open the drawer on the first back press.
* Terminate the app on second back press
* Added an handler to reset the variable after 5 secs

Patch Set 2:
* Make it acting like Google Hangouts:
If the drawer is open -> Finish
If the drawer is closed -> Open it

Patch Set 3 and 4:

* Removed the Handler and the double back as it's no more needed, this is the perfect behavior!
* Little derp

Change-Id: I5ce4430b3e3c6dcd03198634b62b4dc18dca604b
Signed-off-by: iGio90 <giovanni.rocca.90@gmail.com>