Camera2: notify the gallery that camera storage path was changed

need to notify the gallery that user changed the camera storage path
Thanks to Scott Warner for the Gallery part

as well this patche adresses 2 smaller issues

Change-Id: I04b087586254b24dc9b3ec7b50f2d313cc4efbaf
Camera2: add ability to call needAutoFocusCall when using continous picture

Some camera HALs like the one from mako need a autofocuscall on continous picture
focus mode to proper work. Give for this devices the ability to turn this on.

Effected devices need to set the overlay value to truem

PS2:
- fix derp

Change-Id: Iab57406ef0d84dd6747952fac04cb29953f1646c
Camera2: fix power key shutter default behaviour

lol big midnight last minute change derp

Change-Id: I512d3180fb6491113d67ff86853ac549bea33761