arm64: dts: qcom: sc7180: Remove ipa_fw_mem node on trogdor

We don't use this carveout on trogdor boards, and having it defined in
the sc7180 SoC file causes an overlap message to be printed at boot.

 OF: reserved mem: OVERLAP DETECTED!
 memory@86000000 (0x0000000086000000--0x000000008ec00000) overlaps with memory@8b700000 (0x000000008b700000--0x000000008b710000)

Delete the node in the trogdor dtsi file to fix the overlap problem and
remove the error message.

Cc: Alex Elder <elder@linaro.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Fixes: 310b2666 ("arm64: dts: qcom: sc7180: define ipa_fw_mem node")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220517193307.3034602-1-swboyd@chromium.org