[PR] stm32f401rc-rs485: Add sdcard support [nuttx]

[via GitHub]

rcsim opened a new pull request, #11265:
URL: https://github.com/apache/nuttx/pull/11265

   ## Summary
   Add support to sdcard on stm32f401rc-rs485 board.
   ## Impact
   Users will be able to use sdcard
   ## Testing
   
   - Build sdcard configuration
    ./tools/configure.sh -l stm32f401rc-rs485:sdcard
   - Flash the board
   - Access Nuttx Shell and mount the sdcard
     nsh> mount -t procfs /proc
     nsh> mount -t vfat /dev/mmcsd0 /mnt
   - Access the SDCard and create and read a file:
   
![image](https://github.com/apache/nuttx/assets/30301531/8d13878e-076e-47c6-a250-154476625a41)
   
   


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