ANDROID: KVM: arm64: Always unmap protected regions from the host

As part of the host deprivilege process, memory regions advertised in
the "pkvm,protected-region" devicetree nodes are unmapped from the
host stage-2 page-table and annotated specially so that the memory can
be used exclusively by hypervisor modules.

Since the state of this memory in the host stage-2 may not be in the
"owned" state (for example, if it corresponds to a "no-map" region),
remove the initial check of the page state and allow unmapping of any
pages from the trusted host.

Bug: 280380533
Cc: Quentin Perret <qperret@google.com>
Fixes: e8cf4c06 ("ANDROID: KVM: arm64: Move addr_is_allowed_memory() check into host callback")
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ic28a2557d6d515b356645228fd41d3c921826489