Use extcon cable API instead of state API as it is much more
idiomatic.
Signed-off-by: NNikesh Oswal <Nikesh.Oswal@wolfsonmicro.com>
Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
[Modify patch title by Chanwoo Choi]
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>