Make framework-virtualization APIs available for framework

Add framework-virtualization.impl as dependency for framework-minus-apex
to be able to use any AVF API from framework code.

The framework-virtualization belongs to a non-updatable module and is
already listed in frameworks/base/api/api.go, however it was not part of
framework-non-updatable-unbundled-impl-libs because it would have
introduce a circular dependency. It has been resolved by using
framework-non-updatable-unbundled-defaults, which makes
framework-virtualization depend on framework-minus-apex-headers instead.

This also requires framework-non-updatable-unbundled-defaults and
framework-minus-apex-headers to be visible to Virtualization module.

Bug: 410851667
Test: TH
Flag: EXEMPT refactor
Change-Id: Ife7d529b352ceea2998b5736f1fa25acecff08da