extcon: sm5502: Detect OTG when USB_ID is connected to ground

In it's curent state this driver ignores OTG adapters with ID pin
connected to ground. This commit adds a check to set extcon into
host mode when such OTG adapter is connected.

Signed-off-by: Nikita Travkin <nikitos.tr@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>