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Implement primary display order property for display priority customization

Roman Kovalivskyi requested to merge roman.kovalivskyi/drm-hwcomposer:primary-display-order-property into master

There are cases when primary display lookup order should be overridden. This could be achieved with adding system property hwc.drm.primary_display_order, as proposed by Roman Stratiienko in discussion of issue #14.

Example of primary_display_order property usage: hwc.drm.primary_display_order=HDMI-A-2,HDMI-A-1,....

This means that first priority goes to HDMI-A-2 connector, then HDMI-A-1 connector, then everything else. Internal connectors have higher priority than any other connectors not mentioned in property.

Connected connector with highest priority would be selected as a primary display.

I did smoke test with one and two displays and haven't found any new issues.

Edited by Roman Kovalivskyi

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