Revert of [Chromecast] Disable alsa_cma_backend_unittest on desktop x86. (patchset #3 id:40001 of https://codereview.chromium.org/1563053002/ )

Reason for revert:
alsa_cma_backend_unittests is fixed https://codereview.chromium.org/1673843004/

Original issue's description:
> [Chromecast] Disable alsa_cma_backend_unittest on desktop x86.
>
> Internal Cast-CQ crashes when this is run, for unknown reasons. Disable
> this test on the x86 platform so that it is not run while this issue is
> being investigated. This CL should be reverted when this bug is
> resolved.
>
> Bug: b/26429268
>
> BUG=
>
> Committed: https://crrev.com/7f1edfdfb7c282704becfaa5f75db3dbbaa5644b
> Cr-Commit-Position: refs/heads/master@{#367978}

[email protected],[email protected],[email protected],[email protected],[email protected]
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review URL: https://codereview.chromium.org/1675043002

Cr-Commit-Position: refs/heads/master@{#374253}
2 files changed