ARM: dts: msm: update and add new RPM regulators for msmcobalt

LDOs 5 and 7 are missing from msm-pmcobalt-rpm-regulator.dtsi. Add them.

Update the min and max voltages for LDOs 18 and 22 to reflect the
changes in the most recent documentation.

CRs-Fixed: 973067
Change-Id: I57d11af8e63a2a40dcbfa6aae34ee04b286780bc
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>