Add SurfaceFlinger phase offset to configStore

Test: Manual
Bug: None
Change-Id: I64e07154903fedc40c153f4f53fb9a9aeae24dea
diff --git a/configstore/1.0/default/surfaceflinger.mk b/configstore/1.0/default/surfaceflinger.mk
index 5a946f4..49314d7 100644
--- a/configstore/1.0/default/surfaceflinger.mk
+++ b/configstore/1.0/default/surfaceflinger.mk
@@ -5,6 +5,10 @@
     LOCAL_CFLAGS += -DVSYNC_EVENT_PHASE_OFFSET_NS=$(VSYNC_EVENT_PHASE_OFFSET_NS)
 endif
 
+ifneq ($(SF_VSYNC_EVENT_PHASE_OFFSET_NS),)
+    LOCAL_CFLAGS += -DSF_VSYNC_EVENT_PHASE_OFFSET_NS=$(SF_VSYNC_EVENT_PHASE_OFFSET_NS)
+endif
+
 ifeq ($(NUM_FRAMEBUFFER_SURFACE_BUFFERS),3)
     LOCAL_CFLAGS += -DUSE_TRIPLE_FRAMEBUFFER
 endif