dt-bindings: arm: Add Cortex-A715 and X3

Add compatibles for the Cortex-A715 and X3 cores found in some
recent flagship designs.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230216110803.3945747-1-konrad.dybcio@linaro.org


Signed-off-by: Rob Herring <robh@kernel.org>