hwmon: lis3: regulator control

Based on pm_runtime control, turn lis3 regulators on and off.
Perform context save and restore on transitions.

Feature is optional and must be enabled in platform data.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --cc drivers/hwmon/lis3lv02d.c
Simple merge

diff --cc drivers/hwmon/lis3lv02d.h
Simple merge

diff --cc drivers/hwmon/lis3lv02d_i2c.c
Simple merge

diff --cc include/linux/lis3lv02d.h
Simple merge