power: supply: bq24190_charger: add of_match for usb-otg-vbus regulator

This patch adds an of_match for the usb-otg-vbus regulator to
bq24190_charger.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>