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drm_hwcomposer: Add property for config groups

Drew Davenport requested to merge ddavenport/drm-hwcomposer:gitlab-config-group into main

Android framework will change between configs in the same config group dynamically, to support the Multiple refresh rate [1] feature. If the display driver does not support changing modes seamlessly, there will be visible artifacts (blank screen) when changing refresh rates.

Add a property to disable config grouping on devices that do not support seamless mode changes.

[1] https://source.android.com/docs/core/graphics/multiple-refresh-rate

Change-Id: Iec5927ea3af063669f6f7b7aa430e541c1c35428 Signed-off-by: Drew Davenport ddavenport@google.com

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