Add statusToString function.

For libbinder, not having these statuses printed out causes never ending
problems for developers.

Bug: 144534032
Test: libhidl_test tests this, which is on TH here
Change-Id: I02f37fb1e5b743131598ddc95ef89ebdfbdff615
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 98921be..efa4c41 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -125,6 +125,7 @@
     native_bridge_supported: true,
 
     srcs: [
+        "Errors.cpp",
         "FileMap.cpp",
         "JenkinsHash.cpp",
         "NativeHandle.cpp",