regulator: set of_node for qcom vbus regulator

This allows the regulator to be found by devm_regulator_get().

Fixes: 4fe66d5a ("regulator: Add support for QCOM PMIC VBUS booster")

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20200818162508.5246-1-jonathan@marek.ca


Signed-off-by: Mark Brown <broonie@kernel.org>