arm64: dts: qcom: qdu1000: Add IMEM and PIL info region

Add a simple-mfd representing IMEM on QDU1000 and define the PIL
relocation info region, so that post mortem tools will be able
to locate the loaded remoteprocs.

Signed-off-by: Komal Bajaj <quic_kbajaj@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230522151206.22654-3-quic_kbajaj@quicinc.com