dt-bindings: arm: cpus: Add kryo468 compatible

Kryo468 is found in sc7180, so add it to the list of cpu compatibles

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Link: https://lore.kernel.org/r/cd0f3d35ca0fc2944fd97e030a28318ff82dd5c1.1584516925.git.amit.kucheria@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>