Restore devices volume after bluetooth restart

At AvrcpVolumeManager startup, we tried to read the sharedPref and to
save it in the memory. A clean is performed on this list to remove
non-bonded devices.
The issue here is that the getBondState was returning BOND_NONE for all
devices due to check perform on the adapter State.

We don't know why the adapter is not reported as STATE_ON at this point
but this check was added on all method to sanitize the shutdown process.
Because this is a cached value there is no risk from a crash at shutdown

Fix: 228415780
Ignore-AOSP-First: No caching done on AOSP
Test: Manual testing
Change-Id: I52362c3b511054abcb88e0cb83df95ba74c62ef4