AudioService: fix various volume issues.

Fix various issues in adjustStreamVolume() related to stream type aliases
using different ranges.

Always Update last audible index on all streams sharing the same alias.

Add check on setRingerMode() to prevent setting mode to VIBRATE when no
vibrator is present.

Issue 6455831.

Change-Id: Id110e05d2f16e208e1e398922617bf31967b62db