audio policy: update from libhardware_legacy

Merge changes made to AudioPolicyManagerBase in libhardware_legacy
since it was forked here:

fd61179 Update policy handling for USB inputs
c7b6e3c audio: allow compiling for 64-bit
c26f454 Initial implementation of USB Audio output.
a7b1bc9 Audio policy is 32-bit only
26101ad audio policy : add AUDIO_DEVICE_IN_USB_DEVICE to sDeviceNameToEnumTable

Change-Id: I22bc883c20603a6598c6ee3ded636e9cc4d9ec03