mfd: fusb302: correct extcon cable state when enable vbus

mfd: fusb302: correct extcon cable state when enable vbus

Set extcon cable state to EXTCON_USB_VBUS_EN instead of
EXTCON_USB_HOST when enable vbus 5v. Because EXTCON_USB_HOST
state means that fusb302 has detected Type-C mode and the
orientation. However, enable vbus is prior to Type-C mode
and orientation detection. If we set EXTCON_USB_HOST state
when power on vbus, it may cause usb controller driver to
receive the state prematurely, and do tcphy orientation init
improperly.

Change-Id: Id65072dc8235693db44667ee5d2ceac74dc94920
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>