usb: dwc3-generic: support external vbus regulator

Add support for a vbus-supply regulator specified in devicetree. This
provides generic support to avoid hardcoded GPIO configuration in board
init code.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
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This patch has no dependencies

Cc: Marek Vasut <marex@denx.de>
1 file changed