EntropyMixer: add ro.build.fingerprint to the mix

Change-Id: I001d337f61fef9667dd3289461bbafe574652232
diff --git a/services/java/com/android/server/EntropyMixer.java b/services/java/com/android/server/EntropyMixer.java
index 4632374..8c0d260 100644
--- a/services/java/com/android/server/EntropyMixer.java
+++ b/services/java/com/android/server/EntropyMixer.java
@@ -142,6 +142,7 @@
             out.println(SystemProperties.get("ro.bootloader"));
             out.println(SystemProperties.get("ro.hardware"));
             out.println(SystemProperties.get("ro.revision"));
+            out.println(SystemProperties.get("ro.build.fingerprint"));
             out.println(new Object().hashCode());
             out.println(System.currentTimeMillis());
             out.println(System.nanoTime());