Provider: Add multi SIM ringtone support in SettingsProvider

This change will handle multi-sim queries in
SettingsProvider.java when openFile and
openAssetFile APIs are called by other components.
Thus, it will ensure to play the correct ringtone
corresponding to the SIM.

CRs-Fixed: 661216
Change-Id: I7b22c233b9c41669c1ad948b83a7aa2c55442af1