Remove default app permission granting from DefaultPermissionGrantPolicy.

This change removes the permission granting for non-system dialer and
SMS apps in DefaultPermissionGrantPolicy. Permission granting to
system apps is left unchanged. Package manager is also made to query
role manager for the current default dialer instead of maintaining its
own storage.

Bug: 124452117
Bug: 129211673
Test: presubmit
Change-Id: I3c5c122802c3ecf15984a24c24c69a9e2f310bb7