Permit assignment from a null hidl_memory

Bug: 34102220
Test: libhidl_test, hidl_test

Change-Id: Ic0da09f0f6a79643ee44c6b13ef606b2217956e0
diff --git a/Android.bp b/Android.bp
index 5fe6ad5..d44a5e7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -30,6 +30,7 @@
         "libhwbinder",
         "liblog",
         "libutils",
+        "libcutils",
     ],
     static_libs: ["libgtest"],