[PR] boards/szpi-esp32s3: Enable PSRAM [nuttx]

[via GitHub]

JianyuWang0623 opened a new pull request, #16096:
URL: https://github.com/apache/nuttx/pull/16096

   ## Summary
   Enable 8MB PSRAM for szpi-esp32s3, mainly to fix malloc failed error of 
lvgldemo.
   1. boards/szpi-esp32s3: Init configuration for PSRAM 
   2. Documentation/szpi-esp32s3: Add doc for PSRAM
   
   ## Impact
   - boards/szpi-esp32s3
   
   ## Testing
   ```bash
   # lckfb-szpi-esp32s3:nsh
   nsh> free
      total       used       free    maxused    maxfree  nused  nfree name
        332948     161500     171448     178280     171448     39      1 Umem
   
   # lckfb-szpi-esp32s3:psram
   nsh> free
         total       used       free    maxused    maxfree  nused  nfree name
       8785268     161516    8623752     161888    8388592     41      2 Umem
   ```
   
   


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