Re-enable always-on hotwording for m42 on supported hardware.

Re-enable always-on hotwording for m42 on supported hardware.

Revert "Remove hardware check that enables always-on hotwording."

This reverts commit e014345eab81e39c48956f9dae0cc0c66e170f08.

Committed: https://crrev.com/c953e3324bc7d16265d63a8bac6649eef17c3230
Cr-Commit-Position: refs/heads/master@{#313214}

[Anand Mistry (off Chromium), 2015-01-16 02:08:38]

amistry@chromium.org changed reviewers:
+ thestig@chromium.org

[Lei Zhang, 2015-01-16 02:20:02]

lgtm

[Anand Mistry (off Chromium), 2015-01-16 02:33:07]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2015-01-16 02:34:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/838753004/1

[Anand Mistry (off Chromium), 2015-01-16 02:41:40]

The CQ bit was unchecked by amistry@chromium.org

[Anand Mistry (off Chromium), 2015-01-16 02:42:51]

On 2015/01/16 02:34:05, I haz the power (commit-bot) wrote:
> CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/838753004/1

Actually, I should wait until the next dev channel build is cut so I can satisfy
the requirements for merging the previous change to M41.

[Anand Mistry (off Chromium), 2015-01-27 02:13:39]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2015-01-27 02:14:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/838753004/1

[commit-bot: I haz the power, 2015-01-27 03:09:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 03:10:42]

Patchset 1 (id:??) landed as
https://crrev.com/c953e3324bc7d16265d63a8bac6649eef17c3230
Cr-Commit-Position: refs/heads/master@{#313214}