ARM: dts: msm: Introduce OSM CPU clock device node for msmcobalt

Add the OSM CPU clock device node to support CPU clock scale requests.
Include the initial set of frequencies supported by the two clusters
in the msmcobalt chip along with necessary configuration parameters
required by the OSM controllers.

Change-Id: I2ac6fbac62633973e9c40d89d01583be10b51fc0
CRs-Fixed: 967319
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>