dt-bindings: arm: cpus: Add Kryo 560 CPUs

Document Kryo 560 CPUs found in Qualcomm Snapdragon 690 (SM6350).

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210923162204.21752-1-konrad.dybcio@somainline.org