This reverts commit b79c6fba, reversing
these changes made to 0ac26271:

  commit 6a0eb6c9 ("dt-bindings: net: qcom,ipa: make imem interconnect
                       optional")
  commit f8bd3c82 ("arm64: dts: qcom: sc7280: add IPA information")
  commit fd0f72c3 ("arm64: dts: qcom: sc7180: define ipa_fw_mem node")

I intend for these commits to go through the Qualcomm repository, to
avoid conflicting with other activity being merged there.
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20210802233019.800250-1-elder@linaro.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>