ARM: dts: msm: correct pmicobalt_bob regulator name for msmcobalt

The regulator name for the PMICOBALT BOB regulators uses the
prefix "pmcobalt_bob".  Change this to "pmicobalt_bob" so that
the regulator name correctly reflects which PMIC the regulator
is found on.

Change-Id: I018729af22dbd787f42fc3788cbff018be7b4014
CRs-Fixed: 1083306
Signed-off-by: David Collins <collinsd@codeaurora.org>