Remove libstatssocket from statsd_test

Statsd test links both libstatssocket and libstatssocket_private. It
shouldn't need to link both, but needs the private lib to be able to
access hidden APIs like getBuffer. So, remove it from statsd_test.

Test: atest statsd_test
Bug: 150435148
Change-Id: I46e71209489c8b1924800680f26e87ef7f4b8598

cmds/statsd/Android.bp

@@ -122,7 +122,6 @@ cc_defaults {
         "libbinder_ndk",
         "libincident",
         "liblog",
-        "libstatssocket",
         "statsd-aidl-ndk_platform",
     ],
 }
@@ -215,7 +214,10 @@ cc_binary {
         type: "lite",
     },
 
-    shared_libs: ["libgtest_prod"],
+    shared_libs: [
+        "libgtest_prod",
+        "libstatssocket",
+    ],
 
     apex_available: [
         "com.android.os.statsd",