nouveau: move the hotplug ignore to correct place.

commit 8b62c8c6 upstream.

Introduced in b440bde7, however it was added to
the wrong function in nouveau.

https://bugzilla.kernel.org/show_bug.cgi?id=86011


Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>