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Change-Id: Idf0d39445acf8960c79691afec3b74408736c0eb
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

Change-Id: Iad0b72f8b653b3d567b27de3ccf5c6cfb07e40ed