ARM: dts: msm: add stub regulator devices for msmskunk

Add stub regulator devices for the SMPS, LDO, LVS, and BoB
regulators found on the PMCOBALT, PMICOBALT, and PM8005 PMIC
chips which are used on msmskunk boards.  This ensures that
consumers can make use of the regulators which have appropriate
voltage limits.

Change-Id: Iaf1d61a1dddbbcec727d1ce1c358e693b1289a4f
CRs-Fixed: 1055890
Signed-off-by: David Collins <collinsd@codeaurora.org>