OBEX: Support BTOBEX lib.

Add javax.btobex lib to support Obex Over L2CAP
features in further steps.
Add base files from AOSP OBEX lib to btobex folder
at frameworks/base/btobex project for now.

CRs-Fixed: 639499
Change-Id: I983830bce32fbd1446500b9656978e090ca9f259
OBEX: Support OBEX L2CAP features.

OBEX Over L2CAP features from javax.btobex.
Includes SRM and SRMP features support.

Includes existing issue fixes from javax.obex lib

CRs-Fixed: 639499
Change-Id: I70c2a4bfa3bc66532af56dfdb6e1f762aed8e71e
Implement AVRCP VFS and NowPlaying Browsing

Implement AVRCP VFS and NOW PLAYING List browsing
to support the following:

VFS Browsing:
SetBrowsedPlayer
GetFolderItems(Filesystem)
ChangePath
GetItemAttributes
PlayItem(Filesystem)

NowPlaying:
GetFolderItems(NowPlayingList)
PlayItem(NowPlayingList)
EVENT_NOW_PLAYING_CONTENT_CHANGED

CRs-Fixed: 578077
Change-Id: I52a1ec3184e98d5543804ad7350cea46b07f6e00
Bluetooth: Add Power apply enable event handling

Add Wipower Power apply enable related event handling
in frameworks

CRs-fixed: 612628

Change-Id: Iceb0cf8297ad0ab7080c0c494c1404127ff0258a