Remove old GATT API

The subsequent patches will rename QLowEnergyControllerNew to
QLowEnergyController and fix up the documentation fragments which still
point to the old API.

Change-Id: I084e6b1a85a17f424702018f3ad7047bda35d46a
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Further cleanup QLowEnergyServiceInfo

Removes obsolte code from the previos GATT API and other API elements
which do not make any sense under the new API anymore.

The entire purpose of QLowEnergyServiceInfo is also in question
as it doesn't really contain BTLE specifics when compared
to QBluetoothServiceInfo. This requires further API evaluation.

Change-Id: Idfce724bb58150839f756745b87864054909dedb
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>