ozone: evdev: Add property to identify internal or external devices

ozone: evdev: Add property to identify internal or external deviecs

For all event devices, we'll use the device path to find out if it's
permanently attached. Expose this property on EventConverterEvdev and
use it when populating DeviceDataManager.

TEST=chrome on link_freon & rush_ryu
BUG=437539
Committed: https://crrev.com/da116d0e535053f05ddb6a2ffa0aa0e6192f7257
Cr-Commit-Position: refs/heads/master@{#308151}

[spang, 2014-12-11 01:48:34]

spang@chromium.org changed reviewers:
+ rsadam@chromium.org, sadrul@chromium.org

[spang, 2014-12-11 02:04:33]

depends on https://codereview.chromium.org/791743004/

[sadrul, 2014-12-11 15:36:05]

LGTM

[rsadam, 2014-12-12 17:19:14]

lgtm

[spang, 2014-12-12 18:19:32]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2014-12-12 18:20:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/790153005/1

[spang, 2014-12-12 18:22:25]

The CQ bit was unchecked by spang@chromium.org

[spang, 2014-12-12 18:22:26]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2014-12-12 18:22:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/790153005/1

[commit-bot: I haz the power, 2014-12-12 20:32:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-12 20:32:51]

Patchset 1 (id:??) landed as
https://crrev.com/da116d0e535053f05ddb6a2ffa0aa0e6192f7257
Cr-Commit-Position: refs/heads/master@{#308151}