ARM: dts: qcom: sdx65: Add IMEM and PIL info region

Add a simple-mfd representing IMEM on SDX65 and define the PIL
relocation info region, so that post mortem tools will be able to locate
the loaded remoteproc.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1654080312-5408-4-git-send-email-quic_rohiagar@quicinc.com