Add a fallback to USB 2.0 for Luxonis head cameras

[hello-ola]

The head OAK-FFC-3P gives X_LINK_DEVICE_NOT_FOUND when the camera is connected USB2.0.

when camera is not running

sudo lsusb -v 2>/dev/null | awk -v RS="" '/Movidius/' | grep -E "Movidius|bcd"
Bus 003 Device 076: ID 03e7:2485 Intel Movidius MyriadX
  bcdUSB               2.00
  idProduct          0x2485 Movidius MyriadX
  bcdDevice            0.01
  iManufacturer           1 Movidius Ltd.
  iProduct                2 Movidius MyriadX
  bcdUSB               2.00

when camera is running it doesnt show

sudo lsusb -v 2>/dev/null | awk -v RS="" '/Movidius/' | grep -E "Movidius|bcd"
Bus 002 Device 014: ID 03e7:f63b Intel Myriad VPU [Movidius Neural Compute Stick]
  bcdUSB               3.20
  idProduct          0xf63b Myriad VPU [Movidius Neural Compute Stick]
  bcdDevice            1.00
Bus 003 Device 076: ID 03e7:2485 Intel Movidius MyriadX
  bcdUSB               2.00
  idProduct          0x2485 Movidius MyriadX
  bcdDevice            0.01
  iManufacturer           1 Movidius Ltd.
  iProduct                2 Movidius MyriadX
  bcdUSB               2.00

it shows

sudo lsusb -v 2>/dev/null | awk -v RS="" '/Movidius/' | grep -E "Movidius|bcd"
Bus 002 Device 014: ID 03e7:f63b Intel Myriad VPU [Movidius Neural Compute Stick]
 bcdUSB               2.00
 idProduct          0xf63b Movidius MyriadX
 bcdDevice            1.00
Bus 003 Device 076: ID 03e7:2485 Intel Movidius MyriadX
 bcdUSB               2.00
 idProduct          0x2485 Movidius MyriadX
 bcdDevice            0.01
 iManufacturer           1 Movidius Ltd.
 iProduct                2 Movidius MyriadX
 bcdUSB               2.00

This PR preserves the existing preferred behavior by trying SUPER_PLUS first. If that open fails, it logs a warning and retries the same device at UsbSpeed.HIGH.

This gives us the expected fallback behavior explicitly:

1. Use USB3/SUPER_PLUS when available.
2. If the DepthAI SUPER_PLUS boot/open path fails, retry over USB2/HIGH.
3. Keep the camera usable in degraded mode instead of crashing.

used stretch_camera_show -l --opencv

[hello-robot-shehab]

We should figure out why the USB Host drops bandwidth to bcdUSB 2.0 from bcdUSB 3.2 instead of relying on this workaround, but it's good to know that this works, thanks @hello-ola !