Alexa media player only include equalizer if supported sound mode

[balloob]

Breaking change

Proposed change

Alexa media players will only yield the equalizer controller if there is at least 1 supported sound mode.

Probably fixes #34029

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[probot-home-assistant]

Hey there @home-assistant/cloud, @ochlocracy, mind taking a look at this pull request as its been labeled with a integration (alexa) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[ochlocracy]

Looks good to me. 👍