usb: gadget: pch_udc: Detecting VBUS through GPIO with interrupt

Problem:
 pch_udc continues operation even if VBUS becomes Low.
 pch_udc performs D+ pulling up before VBUS becomes High.
 USB device should be controlled according to VBUS state.

Root cause:
 The current pch_udc is not always monitoring VBUS.

Solution:
 The change of VBUS is detected using an interrupt of GPIO.
 If VBUS became Low, pch_udc handles 'disconnect'.
 After VBUS became High, a pull improves D+, and pch_udc
 handles 'connect'.

[ [email protected] : make it actually compile ]

Signed-off-by: Tomoya MORINAGA <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>

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