i2c: i801: Don't restore config registers on runtime PM

i2c: i801: Don't restore config registers on runtime PM

BugLink: https://bugs.launchpad.net/bugs/1802135
Restoring configuration registers is only needed when we hand control
to the firmware. This is never the case with runtime power
management. The device will autosuspend whenever not used, so avoid
useless register writes by defining suspend/resume only, and not
runtime_suspend/runtime_resume.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit a9c8088c7988e3a8a364cac9c26eba9ee2ea6153)
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Acked-by: Anthony Wong <anthony.wong@canonical.com>
Acked-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>