dt-bindings: remoteproc: qcom,sm6350-pas: split into separate file

Split SM6350 remote processor Peripheral Authentication Service bindings
into their own file to reduce complexity and make maintenance easier.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221124184333.133911-10-krzysztof.kozlowski@linaro.org