MediaProvider: MediaScanner behavior on boot (2/3)

Lets you enable/disable/ask (with a notification) media scanning on boot.
Can speed up boot and reduce initial boot lag from MediaScanner

- added xxhdpi icon
- no need for multiuser due that this should be a one time set
  general option set by the owner of the device

Change-Id: Iad0b72f8b653b3d567b27de3ccf5c6cfb07e40ed
MediaProvider: Allow scan for directories

Patchset 2: Allow only directories of external volumes

Change-Id: I5694f75896749d84b163a1213730eaa4c1e776e6
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge tag 'android-4.4.1_r1' into HEAD

Android 4.4.1 Release 1
Merge branch 'kk4.4' of https://github.com/SlimRoms/packages_providers_MediaProvider into kk44

Signed-off-by: scott <scott@ubuntu>

Conflicts:
	src/com/android/providers/media/MediaProvider.java

Change-Id: I3557bb3905b9101b8fddad1ef0e6ac33c08ce811