KVM/X86: Make kvm_vcpu_reload_apic_access_page() static

Make kvm_vcpu_reload_apic_access_page() static
as it is no longer invoked directly by vmx
and it is also no longer exported.

No functional change intended.

Signed-off-by: Quanfa Fu <quanfafu@gmail.com>
Message-Id: <20211219091446.174584-1-quanfafu@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>