Revert "displaycolor: Add support for external displays"

Revert submission 25035359-hwc-displaycolor-ext-display

Reason for revert: DroidMonitor-triggered revert due to breakage b/306074705

Reverted changes: /q/submissionid:25035359-hwc-displaycolor-ext-display

Change-Id: I0ae3662932baf6b9c8b9865420bcad6ee23e39fd
1 file changed