dt-bindings: arm: Add Cortex-A78C and X1C

Add compatibles for the Cortex-A78C and X1C cores found in some
recent flagship designs.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230224130759.45579-1-konrad.dybcio@linaro.org


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