Merge branch kvm-arm64/fwb-for-all into kvmarm-master/next

Merge branch kvm-arm64/fwb-for-all into kvmarm-master/next

* kvm-arm64/fwb-for-all:
  : .
  : Allow pKVM's host stage-2 mappings to use the Force Write Back version
  : of the memory attributes by using the "pass-through' encoding.
  :
  : This avoids having two separate encodings for S2 on a given platform.
  : .
  KVM: arm64: Simplify PAGE_S2_MEMATTR
  KVM: arm64: Kill KVM_PGTABLE_S2_NOFWB
  KVM: arm64: Switch pKVM host S2 over to KVM_PGTABLE_S2_AS_S1
  KVM: arm64: Add KVM_PGTABLE_S2_AS_S1 flag
  arm64: Add MT_S2{,_FWB}_AS_S1 encodings

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