SF: Moving EventThread::Connection out of impl class

This is part of Scheduler refactoring. EventThread::Connection should be
a wrapper that translates IDisplayEventConnection into EventThread calls.

Test: SF tests pass.
Bug: 113612090
Change-Id: I2bcf0c45a33638c59f7828085c563dbc52b2d66e
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index fad56e6..c363ba5 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -126,7 +126,7 @@
     return mConnections[handle->id]->thread.get();
 }
 
-sp<BnDisplayEventConnection> Scheduler::getEventConnection(const sp<ConnectionHandle>& handle) {
+sp<EventThreadConnection> Scheduler::getEventConnection(const sp<ConnectionHandle>& handle) {
     RETURN_VALUE_IF_INVALID(nullptr);
     return mConnections[handle->id]->eventConnection;
 }