arm64: dts: qcom: ipq8074: add interrupt-parent to DTSI

Add interrupt-parent to the SoC DTSI to avoid duplicating it in each board
DTS file.

Remove interrupt-parent from existing board DTS files.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220708133846.599735-2-robimarko@gmail.com