Change systembuilder tag to optional

Change-Id: I78043cb1546fe81234b0b6d88d85a1e7ca3857ce
Signed-off-by: Bruce Beare <brucex.j.beare@intel.com>
diff --git a/Android.mk b/Android.mk
index ac0b872..575c8c6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -11,7 +11,7 @@
 LOCAL_CFLAGS := -O2 -g -W -Wall -Werror
 
 LOCAL_MODULE := diskinstaller
-LOCAL_MODULE_TAGS := system_builder
+LOCAL_MODULE_TAGS := optional
 
 LOCAL_STATIC_LIBRARIES := $(TARGET_DISK_CONFIG_LIB)
 LOCAL_SYSTEM_SHARED_LIBRARIES := \