arm64: dts: qcom: use defines for interrupts

Replace hard-coded interrupt parts (GIC, flags) with standard defines
for readability.  No changes in resulting DTBs.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230730180638.23539-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>