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Detailed Description:
LPUART1 echoes RX signal at 115200 bps
When an 's' char is received, the MCU enters VLPS.
A falling edge of the RX signal brings the MCU from VLPS via LPUART RXEDGIF interrupt.
BUS_CLK can be monitored at CLKOUT PTD14.
In VLPS, BUS_CLK is gated off.
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Test HW: S32K144EVB-Q100
MCU: S32K 0N57U
Debugger: S32DS_ARM_2.2, OpenSDA
Target: internal_FLASH
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