QNX complie error solved.

Random address variable moved from Bluez to both platforms. Added friend class in QLowEnergyCharacteristicInfo.

This was done because on QNX platform it was unable to compile.

Change-Id: I3fc90a05fe8fb6ee2337bd8fab0e1aa2249cd001
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>