Update git submodules

* Update frameworks/native from branch 'master'
  to b9a881465cf0937df3ebe575475cefa5bcc54bfe
  - Merge "binderRpcTest: stronger check for synchronous cbs"
  - binderRpcTest: stronger check for synchronous cbs
    
    We shouldn't need to wait for a synchronous callback result.
    
    Bug: N/A
    Test: binderRpcTest
    Change-Id: I596922ee452298f1e802f6af64bbceb327dbf8dd
    
diff --git a/frameworks/native b/frameworks/native
index 028182d..b9a8814 160000
--- a/frameworks/native
+++ b/frameworks/native
@@ -1 +1 @@
-Subproject commit 028182d974ce2d7c7048245feea3fc41c5dc8929
+Subproject commit b9a881465cf0937df3ebe575475cefa5bcc54bfe