[PR] boards/nrf5340dk: add dev gpio support for nrf5340dk [nuttx]

[via GitHub]

aungkhantmaw64 opened a new pull request, #15956:
URL: https://github.com/apache/nuttx/pull/15956

   ## Summary
   
   I found that the gpio example code can't be tested on nrf5340-dk. 
   Enabling CONFIG_DEV_GPIO wouldn't register gpio pins as /dev/gpio*. 
   NRF5340-dk has 4 LEDs and 4 User Buttons.
   By setting CONFIG_DEV_GPIO=y,
   - 4 LEDs will be configured as GPIO outputs
   - 2 Buttons as GPIO inputs, and
   - 2 Buttons as GPIO interrupt inputs This PR will allows user to test GPIO 
examples on NRF5340-dk board.
   
   ## Impact
   
   This patch is nearly identical to implementation of xiao-nrf52840's 
nrf52_gpio.c. 
   It only impacts board-level initialization.
   
   ## Testing
   
   I've tested this patch on NRF5340-dk itself.
   
![image](https://github.com/user-attachments/assets/f47a0b68-e2f2-4d27-9191-21b8f0f46a60)
   
   
   
   


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