dt-bindings: arm: cpus: Add Kryo 570 CPUs

Document Kryo 570 CPUs found in Qualcomm Snapdragon 750G (SM7225).

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211007212444.328034-9-luca@z3ntu.xyz