extcon: Add documentation for EXTCON_CHG_USB_* and EXTCON_USB_*
Current there is both "EXTCON_USB" and "EXTCON_CHG_USB_SDP" which both seem to suggest a standard downstream port. But there is no documentation describing how these relate. Thus add documentation to describe EXTCON_CHG_USB_SDP should always appear together with EXTCON_USB, and EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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