arm64: dts: qcom: sa8775p: Add IMEM and PIL info region

Add a simple-mfd representing IMEM on SA8775p and define the PIL
relocation info region, so that post mortem tools will be able
to locate the loaded remoteprocs.

Signed-off-by: Tengfei Fan <quic_tengfan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Link: https://lore.kernel.org/r/20240531093531.238075-3-quic_tengfan@quicinc.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>