Add a setting for vendor to set uclamp.min boost for SF main thread

Bug: 190137562
Test: boot and check uclamp.min of SF
Change-Id: Iee4bac8e4cfcb33a284bb7c206fe1dc4400e2ded
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 30d76af..09f3ec7 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -191,6 +191,9 @@
     // set main thread scheduling policy
     static status_t setSchedFifo(bool enabled) ANDROID_API;
 
+    // set main thread scheduling attributes
+    static status_t setSchedAttr(bool enabled);
+
     static char const* getServiceName() ANDROID_API { return "SurfaceFlinger"; }
 
     // This is the phase offset in nanoseconds of the software vsync event