S1: Fix libedgetpu not found

[adamkewley]

Related?:

• Failed to load delegate from libedgetpu.so.1 M.2 Accelerator with Dual Edge TPU google-coral/edgetpu#611
• https://coral.ai/docs/m2/get-started/#2a-on-linux

[adamkewley]

sudo python3 examples/classify_image.py
adding root to apex and plugdev groups.
sudo adduser root apex
sudo usermod -aG plugdev root

[adamkewley]

May require running with sudo?

• Failed to load delegate from libedgetpu.so.1.0 with tflite_runtime 1.14 tensorflow/tensorflow#32743

[adamkewley]

More details for Pi installation defects:

tensorflow/tensorflow#32743 (comment)

[adamkewley]

And people are mentioning that you must ensure USB3 is enabled in the OS etc (we do this, but can double-check):

tensorflow/tensorflow#32743 (comment)

[adamkewley]

I need to speak with the group on Tuesday about this issue. Given that their Pi is otherwise fine, the software matches all other Pis (it wasn't re-flashed or anything), it is looking likely that it's a hardware issue of some sort that is manifesting as a "failure to load library" (because the library's loading procedure seems to involve hardware connections etc.).