This patch add modem power off function in the reboot process according registering
reboot callback to the reboot_notifier_list. Also realizing the spi shutdown function.
Signed-off-by: NBi Chao <chao.bi@intel.com>
Signed-off-by: NChen Jun <jun.d.chen@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>