- Remove debug polling loop from esp32s3_cam_start_capture() that
busy-waited on DMA status register.
- Fix DMA ISR race: stop DMA before invoking capture callback to
prevent ISR re-triggering while callback processes the buffer.
Check priv->capturing before restarting DMA in ISR.
- Move DMA descriptors from struct to heap allocation, avoiding
stack/BSS alignment issues with cache-line-aligned descriptors.
Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
f92b3d8d79