ARM: dts: msm: Increase i2c core4 frequency to max for MSM8909

WCD Codec has CPE and connected in i2c interface with MSM.
CPE image download happens through i2c, during bootup and
session start. So increase the i2c clock to optimize the
image download time.

Change-Id: I961b5a82c5c825e4801f3647c1e1c4c76eb04f39
Signed-off-by: Viraja Kommaraju <virajak@codeaurora.org>