ARM: dts: msm: Add support for clocks for SDM439/429

CPU and GCC clock nodes are required by cpufreq and
other client drivers to be able to scale the frequencies.
Add the table of cpu clock frequencies supported.

Change-Id: Ic357039bc38c7c1f473cc1e33cb80fdaa6833b9b
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>