Add a driver for RAVE Supervisory Processor, an MCU implementing
various bits of housekeeping functionality (watchdoging, backlight
control, LED control, etc) on RAVE family of products by Zodiac
Inflight Innovations.

This driver implementes core MFD/serdev device as well as
communication subroutines necessary for commanding the device.
Signed-off-by: NAndrey Smirnov <andrew.smirnov@gmail.com>
Acked-by: NPhilippe Ombredanne <pombredanne@nexb.com>
Acked-by: NPavel Machek <pavel@ucw.cz>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: NChris Healy <cphealy@gmail.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>