[TVMC] Adds ethos-u-vela dependency in the "tvmc" set of dependencies. (

#9590)

The ethos-u-vela dependency is required for tvmc, given we support
"ethos-u" as one part of our tvmc targets, therefore, we need to
add this package to the optional set of dependencies that users
explicitly ask when using tvmc.

There is no impact for other sets of dependencies.

python/gen_requirements.py

@@ -143,6 +143,7 @@
         (
             "Requirements for the tvmc command-line tool",
             [
+                "ethos-u-vela",
                 "future",  # Hidden dependency of torch.
                 "onnx",
                 "onnxruntime",