hammerhead: set TARGET_USES_ION to true

Change-Id: Iae2b52cc80ad5fbd9a9a57460ed26113aae9637d
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 271ed70..26d7335 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -54,6 +54,7 @@
 BOARD_EGL_CFG := device/lge/hammerhead/egl.cfg
 
 USE_OPENGL_RENDERER := true
+TARGET_USES_ION := true
 
 TARGET_USERIMAGES_USE_EXT4 := true
 BOARD_BOOTIMAGE_PARTITION_SIZE := 23068672