KVM: x86: Fold "write-protect large" use case into generic write-protect

Drop kvm_mmu_slot_largepage_remove_write_access() and refactor its sole
caller to use kvm_mmu_slot_remove_write_access().  Remove the now-unused
slot_handle_large_level() and slot_handle_all_level() helpers.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210213005015.1651772-14-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>