microdroid: Remove default_prop access

This adds properties necessary to run microdroid to property_contexts,
and then removes default_prop access to all domains except for init, as
init should be able to write all properties.

Bug: 194447534
Test: atest MicrodroidHostTestCases ComposHostTestCases
Change-Id: I2f80c71ce257613b3c3b019a3e988a5a0653d879
3 files changed