kvm: vmx: Rename NR_AUTOLOAD_MSRS to NR_LOADSTORE_MSRS

Rename NR_AUTOLOAD_MSRS to NR_LOADSTORE_MSRS.  This needs to be done
due to the addition of the MSR-autostore area that will be added in a
future patch.  After that the name AUTOLOAD will no longer make sense.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>