media: qcom: camss: add management of supply regulators to CSIPHY

media: qcom: camss: add management of supply regulators to CSIPHY

This change allows to properly assign and manage supply regulator
resources by CSIPHY subdevices of CAMSS, this is needed to fine tune
description of supply regulators on newer platforms, conversion of
old platforms to the new scheme is also anticipated.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Tested-by: Depeng Shao <quic_depengs@quicinc.com> # SM8550
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>