QLowEnergyService - primary/secondary (OS X and iOS)

It looks like isPrimary property is always 'NO' on CBService objects
discovered making this property ... hmm, TOTALLY USELESS?

Change-Id: Ia38323c204e6cf1c3def3bbb3deb08bb8cdf90e4
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>