ANDROID: KVM: arm64: Deprecate late pKVM module loading

Previously it was possible to load a pKVM module after the userspace has
started, leaving on the modules the task of disabling the feature
(__pkvm_close_module_registration HVC).

Depreacte this way of loading modules in favor of the pre-userspace
loading via the cmdline kvm-arm.protected_modules=<module1>,<module2>.

Bug: 254835242
Change-Id: I38eef46b1482ff03af610b3b5d21b3ebfadda59b
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
[ qperret: fixed trivial conflict in nvhe/iommu.c due to aosp/2571370 ]
Signed-off-by: Quentin Perret <qperret@google.com>