KVM: arm64: Remove KVM_ARM_VCPU_POWER_OFF from protected VMs allowed features in pKVM

The hypervisor is responsible for the power state of protected
VMs in pKVM. Therefore, remove KVM_ARM_VCPU_POWER_OFF from the
list of allowed features for protected VMs.

Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20241216105057.579031-5-tabba@google.com


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