Add SurfaceFlinger component to OWNERS for SF, RE, and libgui

Raised on b/288345762#comment3

go/xts-owners-policy is XTS-specific, but the syntax is applicable

Bug: N/A
Test: N/A
Change-Id: I97e95ad89f0226e196675cbbf7bf0fd3a948b5a2
diff --git a/libs/gui/OWNERS b/libs/gui/OWNERS
index 826a418..070f6bf 100644
--- a/libs/gui/OWNERS
+++ b/libs/gui/OWNERS
@@ -1,3 +1,5 @@
+# Bug component: 1075131
+
 chrisforbes@google.com
 jreck@google.com