Fallback to default DispSync phase offsets

Removes the setting of VSYNC_EVENT_PHASE_OFFSET_NS to 0 in favor of
falling back to the SurfaceFlinger default.

Bug: 30801895
Change-Id: Id37d4e158dad81cd88205646f894a84741e82c8e
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 59f76ff..bcead18 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -27,7 +27,6 @@
 USE_OPENGL_RENDERER := true
 
 BOARD_USE_LEGACY_UI := true
-VSYNC_EVENT_PHASE_OFFSET_NS := 0
 
 TARGET_USERIMAGES_USE_EXT4 := true
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 576716800