Switch KVM/arm64 to the generic entry code, courtesy of Oliver Upton

* kvm-arm64/generic-entry:
  KVM: arm64: Use generic KVM xfer to guest work function
  entry: KVM: Allow use of generic KVM entry w/o full generic support
  KVM: arm64: Record number of signal exits as a vCPU stat
Signed-off-by: Marc Zyngier <maz@kernel.org>