macOS: Do layer updates via the CALayerDelegate protocol

The updateLayer function is only called when the layer is a
_NSViewBackingLayer instance, which is what the default
implementation of [NSView makeBackingLayer] returns.

Once we move to optionally returning a CAMetalLayer, we need
to use the more generic displayLayer: API, so we do that now
as a first step.

This matches the way we draw and send expose events on iOS.

Change-Id: I49721ff005ca9dfddebff645705f96b5ab46abb4
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

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