ARM: dts: msm: Enable 960MHz Acpuclk support for MSM8939

This change adds 960MHz in the Acpu clock table for big cluster.
This is required for tuning interactive governor's high speed
frequency.

Change-Id: Iee478d786b55470d510669a90d47d2745194cf13
Signed-off-by: Krishna Vanka <kvanka@codeaurora.org>