remove bt_status logic from bt-core

remove bt_status logic from bt-core

This is no more relevant since enable/disable function is done through dbus.
Now a changed power state is acknowledged in bluez event receiver.
Moreover bt-core could stay in a wrong BT_ACTIVATING or BT_DEACTIVATING state
if bluetooth state is modified by an external way.

Keep Tizen Mobile compatibility using __TIZEN_MOBILE__ macro in calling scripts
to enable/disable bt adapter. Those scripts allows to also stop/start other Tizen
bluetooth components (i.e. bluetooth-share, bluetooth-agent,...).

Change-Id: I7d6816f0a750f775f1b5a659174a63d663d81c3f
Signed-off-by: Corentin Lecouvey <corentin.lecouvey@open.eurogiciel.org>