Let system UID define build fingerprint.

Some devices leave "ro.build.fingerprint" undefined at build time,
since they need to build it from the components at runtime.

Bug: 13340779
Change-Id: I033ff7600e68edffdea101fec30246135646b4b2
diff --git a/init/property_service.c b/init/property_service.c
index 9613973..8247ef4 100644
--- a/init/property_service.c
+++ b/init/property_service.c
@@ -97,6 +97,7 @@
     { "persist.gps.",      AID_GPS,      0 },
     { "persist.service.bdroid.", AID_BLUETOOTH,   0 },
     { "selinux."         , AID_SYSTEM,   0 },
+    { "build.fingerprint", AID_SYSTEM,   0 },
     { "partition."        , AID_SYSTEM,   0},
     { NULL, 0, 0 }
 };