MAP: Add following new files for MAP1.2 Email Instance Support.

Base Reference for BluetoothMapEmailContract.java is existing
BluetoothMapContract.java.
Base reference for BluetoothMapAccoutnEmailLoader.java is
existing BluetoothMapAccoutnLoader.java
Base reference for BluetoothMapContentEmail.java is existing
BluetoothMapContent.ajva
Base reference for BluetoothMapContentObserverEmail.java is existing
BluetoothMapContentObserver.java
Base reference for BluetoothMapbMessageExtEmail.java is existing
BluetoothMapbMessageEmail.java

Actual MAP1.2 Email instance support is included from further
gerrits.

Change-Id: Ic59e03223e305ce92bb179199f6295fcaa5f995a