[Ozone-DRM] Use CRTC's mode when configuring it for mirror mode

[Ozone-DRM] Use CRTC's mode when configuring it for mirror mode

Using the same mode on both CRTCs may not work if the timings are not
correct. This patch configures the CRTC independently such that each one
uses its own mode and timings.

Also split modesetting from re-enabling so it is easier to reason when
the CRTC's current mode can be reused.

BUG=chrome-os-partner:42915
Committed: https://crrev.com/e342544e82671b42b94e1f2f6400ddb0a5c3b49a
Cr-Commit-Position: refs/heads/master@{#348613}

[dnicoara, 2015-09-11 18:46:02]

dnicoara@chromium.org changed reviewers:
+ alexst@chromium.org, dbehr@chromium.org

[dnicoara, 2015-09-11 18:46:02]

dbehr@ could you give this a try?

[alexst (slow to review), 2015-09-11 19:30:14]

lgtm

[dnicoara, 2015-09-11 20:00:40]

On 2015/09/11 19:30:14, alexst wrote:
> lgtm

Could you take another look since I've removed HDC::get_mode() per dbehr@'s
comment in the bug.

[dbehr, 2015-09-11 21:20:35]

lgtm

[dnicoara, 2015-09-11 22:00:30]

The CQ bit was checked by dnicoara@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-11 22:00:46]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1338843002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1338843002/40001

[commit-bot: I haz the power, 2015-09-12 01:27:37]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-12 01:27:38]

Dry run: Try jobs failed on following builders:
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[dnicoara, 2015-09-14 14:07:26]

The CQ bit was checked by dnicoara@chromium.org

[dnicoara, 2015-09-14 14:07:26]

The patchset sent to the CQ was uploaded after l-g-t-m from alexst@chromium.org
Link to the patchset: https://codereview.chromium.org/1338843002/#ps40001
(title: "Removed get_mode() from HDC per dbehr@'s comment")

[commit-bot: I haz the power, 2015-09-14 14:07:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1338843002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1338843002/40001

[commit-bot: I haz the power, 2015-09-14 14:26:37]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-09-14 14:27:21]

Patchset 3 (id:??) landed as
https://crrev.com/e342544e82671b42b94e1f2f6400ddb0a5c3b49a
Cr-Commit-Position: refs/heads/master@{#348613}

[commit-bot: I haz the power, 2015-09-23 12:32:17]

Patchset 3 (id:??) landed as
https://crrev.com/e342544e82671b42b94e1f2f6400ddb0a5c3b49a
Cr-Commit-Position: refs/heads/master@{#348613}