Enable USB Serial only if selected

[me-no-dev]

USB Serial seems to get enabled even if we do not select USB CDC ON BOOT. This should fix it

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Enable USB Serial only if selected": summary looks empty type/action looks empty the commit message "fix examples": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

	Messages
📖	You might consider squashing your 3 commits (simplifying branch history).

👋 Hello me-no-dev, we appreciate your contribution to this project!

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[SuGlider]

LGTM.

[SuGlider]

@me-no-dev - please merge it soon because I will rebase the PR about HWCDC/SOF with this changes, before releasing it.

[me-no-dev]

@SuGlider done :)