MediaProvider: Add feature to support group music by folder path

There is no support to group music by folder path.

Add extra query sql statement for supporting group music
by folder path.

CRs-Fixed: 620983

Change-Id: If0036efe8c9ebbea11c7aca1752e1d12b2287955
Merge "MediaProvider: Add feature to support group music by folder path" into du44