fix(drivers): Do not show warnings if no DShot is configured

[ttechnick]

Solved Problem

Currently, when no dshot actuator is configured this warning is shown:

WARN  [dshot] No channels configured
INFO  [dshot] Exiting
ERROR [module] Task start failed (-1)

The warning seems a bit extreme to me, as there are a lot of setups without any dshot.
And the Error implies that something went wrong, even though everything is just fine.

Solution

Convert the WARNING to INFO
Do not return an error when the module stops after no channel is configured.

Changelog Entry

For release notes:

Bugfix: No warning when dshot voluntarily exits

Alternatives

It would be better do only remove the warning, if no channel is found and not as generic as this solution, however I was not able to find a good solution for that.

Test coverage

Tested on HW.
With this PR:

INFO  [dshot] No channels configured
INFO  [dshot] Exiting