ARM: dts: msm: Increase max krait voltage for msm8974 Pro

Voltage plan has been updated with a higher maximal voltage.  Modify
corresponding voltages limits in DT to allow new voltage.

Change-Id: I85ff9037a9089589979cf157f3e852657444aeb1
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>