SF: fix binder thread priority

Add setMinSchedulerPolicy to all binder interfaces SF exposes.
It was missing from gui::ISurfaceComposer and
gui::IDisplayEventConnection.

Test: presubmit
Bug: 299378819
Change-Id: Ia0d99efa5a3bc58625c320d4df3c08bb597d2e38
diff --git a/services/surfaceflinger/Client.h b/services/surfaceflinger/Client.h
index af410ea..77916e0 100644
--- a/services/surfaceflinger/Client.h
+++ b/services/surfaceflinger/Client.h
@@ -55,6 +55,8 @@
 
     binder::Status mirrorDisplay(int64_t displayId, gui::CreateSurfaceResult* outResult) override;
 
+    binder::Status getSchedulingPolicy(gui::SchedulingPolicy* outPolicy) override;
+
     // constant
     sp<SurfaceFlinger> mFlinger;