dt-bindings: remoteproc: qcom,sdx55-pas: split into separate file

Split SDX55 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>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221124184333.133911-13-krzysztof.kozlowski@linaro.org