Merge branch kvm-arm64/visibility-cleanups into kvmarm-master/next

* kvm-arm64/visibility-cleanups:
  : .
  : Remove REG_HIDDEN_USER from the sysreg infrastructure, making things
  : a little more simple. From the cover letter:
  :
  : "Since 4d4f5205 ("KVM: arm64: nv: Drop EL12 register traps that are
  : redirected to VNCR") and the admission that KVM would never be supporting
  : the original FEAT_NV, REG_HIDDEN_USER only had a few users, all of which
  : could either be replaced by a more ad-hoc mechanism, or removed altogether."
  : .
  KVM: arm64: Get rid of REG_HIDDEN_USER visibility qualifier
  KVM: arm64: Simplify visibility handling of AArch32 SPSR_*
  KVM: arm64: Simplify handling of CNTKCTL_EL12

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