Staging: add driver for adis16255 gyroscope

This drivers allows a communication with the Analog Devices ADIS16255
Low Power Gyroscope over SPI.

Signed-off-by: Matthias Brugger <mensch0815@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>