Fix compilation issues while disabling HAL compilation

Fix compilation issues while disabling HAL compilation

This patch takes care of following:-

1. Removes bt_hal compilation flag as after code 4.0
   synchronization, "bt-service" is removed from compilation
   by default, which means now bluetooth-frwk will build
   with BT OAL by default. BT OAL will either use
   BlueZ HAL or other HAL implementation (possibly in future)

2. Move hardware out of bluez_hal and place it inside BT OAL
   directly. BT OAL compilation should only depend upon
   hardware's BT header files. hardware should not be tied with
   HAL implementation. This is in same line with In AOSP upstream,
   where hardware is provided separately inside libhardware project.
   As a result of this change, BT OAL will now build independently,
   however, it needs either Bluez HAL or other HAL implementation
   library for prividing all BT stack functionalities.

3. Fix few compilation issues in OAL's AVRCP TG and CT files
   if bt_bluez_hal is disabled.

Note: bt_bluez_hal compilation flag is by default ON. If this is disabled
      BT OAL will be built but with no underlying HAL implementation.

Change-Id: I3b9f8f27651b06826702bab10ce734098ef7f660
Signed-off-by: Anupam Roy <anupam.r@samsung.com>