MvvmCross.Plugins.BLE.macOS: fix some obsolescence warnings
MvvmCross.Plugins.BLE.macOS: fix some obsolescence warnings

* use the same code as in MvvmCross.Plugins.BLE.iOS

Warning CS0618: 'Mvx.Resolve<TService>()' is obsolete: 'Use Mvx.IoCProvider instead' (CS0618) (MvvmCross.Plugins.BLE.macOS)
Warning CS0618: 'Mvx.LazyConstructAndRegisterSingleton<TInterface>(Func<TInterface>)' is obsolete: 'Use Mvx.IoCProvider instead' (CS0618) (MvvmCross.Plugins.BLE.macOS)

xabre/xamarin-bluetooth-le,fozzzgate/xamarin-bluetooth-le