regulator: Further restrict RZG2L USB VBCTRL regulator dependencies

Since the regulator can't be used without the USB controller also
tighten the dependency to match, as well as the default.

Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20240726-regulator-restrict-rzg2l-v1-1-640e508896e2@kernel.org


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