Cleanup of BtLE code

1.) Remove dead pieces of code
2.) Fix warnings
3.) Optimize some code lines

Change-Id: I952fe34e8966a501a54c9ef42e9624c1fc46a2a1
Reviewed-by: Nedim Hadzic <nhadzic@blackberry.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>