Give some breath to fugu's system image.

Change-Id: I208ecc92a48890af5c0b7900057922cb1e05cd99
diff --git a/device.mk b/device.mk
index 9d8eb03..03ffb92 100644
--- a/device.mk
+++ b/device.mk
@@ -255,4 +255,7 @@
 PRODUCT_COPY_FILES += \
     device/asus/fugu/sep_policy.conf:system/etc/security/sep_policy.conf
 
+# Without this filter, we get very close to the limit.
+PRODUCT_DEX_PREOPT_DEFAULT_FLAGS += --compiler-filter=space
+
 #PRODUCT_CHARACTERISTICS := tablet