Layout autoenable external display External displays are disabled by default. Now display_layout_configuration.xml can have external display unique id, which allow changing the default enable/disable state upon external displays connection. Bug: 497874567 Bug: 439678646 Test: atest ExternalDisplayPolicyTest DisplayManagerServiceTest LogicalDisplayMapperTest Flag: EXEMPT BUGFIX Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d74fa7f74acf794d8d30cbd7b418d7c4787809f9 Merged-In: If4941bcc5316e3b69691e0080c7ba8e46f951aa6 Change-Id: I6b3ad1bef909ee60228e24a9de72e766429f7640