ARM: dts: msm: Add cpp root clock for msmcobalt

CPP core root clock needs to be enabled before enabling
the branch clock which is controlled by driver.

CRs-Fixed: 1066138 1070792

Change-Id: I0b86917b06e548cd2e7455ecaaf01f0f71c6b0ff
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>