dt-bindings: perf: Convert Arm CCN to DT schema

Convert the Arm CCN performance monitors binding to DT schema format.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20220613145554.3727354-1-robh@kernel.org