KVM: arm64: Extend pKVM selftest for np-guests

The pKVM selftest intends to test as many memory 'transitions' as
possible, so extend it to cover sharing pages with non-protected guests,
including in the case of multi-sharing.

Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20250416160900.3078417-5-qperret@google.com


Signed-off-by: Marc Zyngier <maz@kernel.org>