Change code from using now deprecated DT_<COMPAT>_<INSTANCE>_<PROP>
defines to using DT_INST_<INSTANCE>_<COMPAT>_<PROP>.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
MHU (Message Handling Unit) enables software to raise interrupts to
the processor cores. It is enabled in SSE 200 subsystems.
This patch aims to implement inter processor communication.
Signed-off-by: Karl Zhang <karl.zhang@linaro.org>