kvmvapic: Enter inactive state on hardware reset

ROM layout may change after reset of devices are hotplugged, so we have
to pick up the physical address again when the ROM is initialized. This
is best achieved by resetting the state to INACTIVE.

CC: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
