dt-bindings: remoteproc: qcom,msm8996-mss-pil: Add SDM660 compatible

Mention sdm660-mss-pil in compatibles list.

Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230621175046.61521-1-alexeymin@postmarketos.org


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