ARM: dts: msm: update PMIC LDO regulator voltage limits for sdm845

Update the minimum and maximum voltage limits for PM8998 LDO
regulators in order to match the limits imposed by bootloader
configurations.

Change-Id: I62f20657764d55dc0fb6cc5f5b5d92c38374bd48
Signed-off-by: David Collins <collinsd@codeaurora.org>