dts: arm/ti/mspm0: add cpu power states for MSPM0 series

add range of cpu power states (run/sleep, stop and standby) for MSPM0
series. add exit latencies ranging from 1.5-15.7µs and minimum
residency times of 5-10ms for optimal power management transitions.

Signed-off-by: Sanjay Vallimanalan <sanjay@linumiz.com>
Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>