ARM: dts: msm: Use new railway resources for pmdcalifornium regulators

A new scalar resource has been introduced for VDD_CX/VDD_MX
RPM votes. Update the respective regulator nodes to use this
resource.

CRs-Fixed: 887818
Change-Id: I239cf1961a2fdcdb272b0270d48f14ec7354136d
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>