MediaProvider: Make folder music change when delete music

Lack the register for folder music uri,which cause the data
not change we obtain the change from uri.

Register uri for folder music to make correspoing cursor
change when data change.

CRs-fixed: 661198

Change-Id: I3b36851e0592efee66ae107b73ce3c43153b3913
Merge "MediaProvider: Make folder music change when delete music" into du44