ARM64: dts: qcom: Enable CPU/CCI/Bus scaling support for MSM8994

Different clusters support different frequencies. Use separate cpufreq
tables for different clusters.

Also enable CCI/Bus voting support by adding related devices.

Change-Id: I11da801f1b07a8be1dd8e12f6b445259cc861ac9
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>