[PR] xtensa/esp32s3: Add SPIRAM high memory support [nuttx]

[via GitHub]

cwespressif opened a new pull request, #11287:
URL: https://github.com/apache/nuttx/pull/11287

   ## Summary
   
   - Configurable mapping of virtual address to psram physical address
   - Access SPIRAM memory at high physical address through bank switching
   
   ## Impact
   
   ## Testing
   
   The himem driver was successfully tested in `esp32s3-devkit:psram_octal` 
using the `esp32_himem` example.
   
   `./tools/configure esp32s3-devkit:psram_octal`
   
   Added `CONFIG_ESP32S3_SPIRAM_MAP` and `CONFIG_ESP32S3_SPIRAM_VADDR_MAP_SIZE` 
configurations
   Enable `esp32_himem` example via `make menuconfig`.
   
![image](https://github.com/apache/nuttx/assets/63690793/0a64ad68-ad28-4d6b-9633-caaf37a7ff20)
   


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