ARM: dts: msm: Add cpu-map for MSM8994

Add the cpu-map node for MSM8994 which describes the topology
correctly and in a way that can be parsed by topology driver.

Change-Id: I0c156bc6dca6686397f8c9ecf1a42cad89be5dd3
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>