dt-bindings: remoteproc: Add Q6v5 Modem PIL binding for SDM845

Add new compatible string for Qualcomm SDM845 SoCs

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>