ANDROID: KVM: arm64: pkvm: Allow the shadows to be destroyed on teardown

There is no difference between protected and non-protected guests
when it comes to shadow structures, and we want these shadow
structures to have the same life cycle.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Bug: 209580772
Change-Id: I7e9bf366aae6bd0542d0038d24e2350a9dd23cd0
Signed-off-by: Will Deacon <willdeacon@google.com>