ARM: dts: msm: update PMIC regulator voltage limits for KONA

Update the minimum and maximum voltage limits for each of the
PMIC regulators found on KONA boards so that they match the
latest hardware guidelines.

Change-Id: If6a9c5e577d15dc7788606616e674670f2fecfda
Signed-off-by: David Collins <collinsd@codeaurora.org>