[PR] arm/stm32f401rc-rs485: Add support to GPIO Subsystem [nuttx]

[via GitHub]

rcsim opened a new pull request, #15861:
URL: https://github.com/apache/nuttx/pull/15861

   ## Summary
   This PR adds support to GPIO Subsystem for STM32F401RC RS485 board.
   
   ## Impact
   Users will be able to use GPIO subsystem, including adding GPIO as Output, 
Input and Input with Interruption.
   
   ## Testing
   - Select NSH or USBNSH Config.
   - Use Menuconfig to enable CONFIG_DEV_GPIO  and CONFIG_EXAMPLES_GPIO
   - Build and load the firmware in the board
   - Access NuttShell and use gpio command:
   ```
   nsh> gpio -o 0 /dev/gpio1
   Driver: /dev/gpio1
     Output pin:    Value=1
     Writing:       Value=0
     Verify:        Value=0
   nsh> gpio -o 1 /dev/gpio1
   Driver: /dev/gpio1
     Output pin:    Value=0
     Writing:       Value=1
     Verify:        Value=1
   nsh> gpio /dev/gpio0
   Driver: /dev/gpio0
     Input pin:     Value=0
   nsh> gpio -w 1 /dev/gpio2
   Driver: /dev/gpio2
     Interrupt pin: Value=0
     Verify:        Value=1
   ```
   


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