Enable MCU UARTs

Connect usb typec cable from pc to typec port J15 of board.(It will emulate four serial ports[e.g. COM0 - LPUART8, COM1, COM2 - LPUART1, COM3 - LPUART2] in pc)
- COM0(LPUART8 - use as uart of cortex-m33 core1)
- COM2(LPUART1 - use as uart of Cortex-A)
- COM3(LPUART2 - use as uart of Cortex-m33 core0)
Connect two usb2uart converter from pc to arduino interface of board.(It will emulate two serial ports[e.g. COM4 - LPUART11, COM5 - LPUART12] in pc)
- COM4(LPUART11 - use as uart of cortex-m7 core0)
  
  J48-2(M2_UART11_RXD) – TX of usb2uart converter – pc
  
  J48-4(M2_UART11_TXD) – RX of usb2uart converter – pc
  
  GND —————– GND of usb2uart converter – pc
- COM5(LPUART12 - use as uart of cortex-m7 core1)
  
  J44-4(M1_UART12_RXD) – TX of usb2uart converter – pc
  
  J44-2(M1_UART12_TXD) – RX of usb2uart converter – pc
  
  GND —————– GND of usb2uart converter – pc
Note:
- mx943evk for m33_image.bin is used for rpmsg str echo, rpmsg ping pong and power_mode_switch_rtos.
- mx943alt for m33_image.bin is used for almost other examples.
- JTAG cannot be used when LPUART8 is used.
- Pls change uart from LPUART8 to LPUART1 and generate m33_image.bin with command make config=mx94alt all when debugging with jtag.
  - For MCUXPresso SDK
```
_boards/imx943evk/board.h
    #define BOARD_DEBUG_UART_INSTANCE 8 -> #define BOARD_DEBUG_UART_INSTANCE 1
```