This driver won't instantiate if OF is not configured, thus add OF dependency.
Also add COMPILE_TEST to increase build testing coverage.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>