Each group of MSI interrupts is mapped to the separate host interrupt.
Describe each of interrupts in the device tree for PCIe hosts.  Only
boot tested on hardware.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-HDK
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240126-b4-dt-bindings-pci-qcom-split-dts-v2-5-0bb067f73adb@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>