Fix memory information in device context on iOS

[limbonaut]

Memory information in device context is disabled in Godot SDK on iOS as it generates errors in Godot. Investigate if we need to collect this information in Godot SDK, or perhaps Cocoa SDK already handles this.

Godot issue:

• Accessing OS.get_memory_info() causes runtime errors on iOS godotengine/godot#109073

[linear]

GODOT-91 Fix memory information in device context on iOS

[limbonaut]

We don't add the device context in the GDExtension on Apple platforms, because it's done automatically by Cocoa SDK. So this issue is no longer relevant.