ARM: dts: msm: Change the typical voltage for XR Reference devices

Typical voltage for XR Reference devices is 5.7V and Min. voltage is 5.6V
Most of the devices work with minimum range but few devices not work when
reboot is issued repeatedly. So, changing the minimum voltage to typical
fixes the issue.

Change-Id: I9d16862bd84e56e81075be8c896f91594107ca4d