SF: Bundle ftl::Flags for CompositionCoverage

...as they will later be passed to Scheduler via ICompositor. For now,
extract ICompositor to its own header, alongside CompositionCoverage.

Bug: 241285475
Bug: 241285191
Test: Frame misses are still traced.
Change-Id: I1562893c9357a02aa42516e775700065b9b17e4b
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 1fc1519..1e97f35 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -34,6 +34,8 @@
 #include <utils/Trace.h>
 
 #include <FrameTimeline/FrameTimeline.h>
+#include <scheduler/interface/ICompositor.h>
+
 #include <algorithm>
 #include <cinttypes>
 #include <cstdint>