ARM: dts: msm: Add the CCI clock to the 8994 pm node

Allow idle driver to enable/disable the CCI clock during RPM assisted power
collapse. Each core count towards as one enable vote for the CCI clock.

Change-Id: I501755cdc3975e0f00d7ade9a1d97cf296ca0b97
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>