ARM: dts: msm: Add device-tree nodes for cpufreq driver

This change adds the device-tree node for cpufreq device along with
the frequency table for power and perf clusters for msm cobalt.

Change-Id: I24b593f26060bfafd2c55faa6e88e4370d305c1e
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>