camera reset by power down line: make delay configurable

[hsteinhaus]

Checklist

• Checked the issue tracker for similar issues to ensure this is not a duplicate.
• Described the feature in detail and justified the reason for the request.
• Provided specific use cases and examples.

Feature description

Certain boards contain a fixed-function reset component to reset the camera during power-up. For instance the the M5Stack AtomS3R-CAM uses a reset circuit called CN809S, that introduces a fixed delay of 140+ ms after the pwdn line level came down.

On such boards, the SCCB_Probe() will subsequently fail to detect the sensor, that is still held in reset by the reset circuitry.

Use cases

All boards that employ a camera reset logic that cannot be controlled by the MCU. This is quite common in case of lack of PCB space or available GPIOs.

Alternatives

Changing the hardware - not really an option for a component sourced commercially out of the shelf.

Additional context

Link to the affected product: https://docs.m5stack.com/en/core/AtomS3R%20Cam
Schematic of the affected board: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/products/core/AtomS3R%20Cam/Sch_M5_AtomS3R_CAM%E5%B0%8F%E6%9D%BF.pdf

Affected line of code:

esp32-camera/driver/esp_camera.c

Line 196 in 4467667

vTaskDelay(10 / portTICK_PERIOD_MS);