ARM: dts: msm: update PMIC LDO regulator voltage limits for sdxpoorwills

Update the minimum and maximum voltage limits for pmxpoorwills LDO
regulators in order to match the limits imposed by bootloader
configurations.

CRs-Fixed: 2155864
Change-Id: I7b36784d73b29b8190a46058dd05a6bd793e5be1
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>