GitLab

If the device supports atomic APIs, use drmModeAtomicCommit to modeset
and disable instead of drmModeSetCrtc.
Abstracted Modeset and Disabled code to HDPM to handle both atomic and
legacy call.
Updated tests to support Connector and CRTC props.

BUG=987274
TEST=HardwareDisplayControllerTest.CheckModesettingSetsProps,
HardwareDisplayPlaneManagerLegacyTest.Modeset,
HardwareDisplayPlaneManagerLegacyTest.DisableModeset,
HardwareDisplayPlaneManagerAtomicTest.DisableModeset, Tested on
Nautilus(Intel), Grunt(AMD) and Cave(Legacy).

Change-Id: Ic307c04df4e22d1696abb31ebcd820f6bdcb542a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715751
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735013}