extcon: arizona: Update binding docs to mention new defines for GPSW

Update the binding documentation to mention the defines added for the
possible values of wlf,gpsw.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
1 file changed