ARM: dts: msm: Update the Norm frequency for Venus

"Norm" level frequency value changed for MSM8994.
Hence modify the corresponding entry in dtsi file.

Change-Id: I0477f272063b0a07b1eb14ccb3217e8b9d13fdfb
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>