arm64: dts: qcom: sc7280-idp: don't modify &ipa twice

In "sc7280-idp.dts", the IPA node is modified after being defined.
However that file includes "sc7280-idp.dtsi", which also modifies
the IPA node (in the same way).  This only needs to be done in
"sc7280-idp.dtsi".

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221108201625.1220919-1-elder@linaro.org