Add "com.android.os.statsd" to libprocessgroup apex_available

The dependency path that determined libprocessgroup is in the
com.android.os.statsd APEX is:

  com.android.os.statsd
    shared lib -> libstatspull
    static lib -> libutils
    shared lib -> libprocessgroup

Bug: 152762638
Test: m droid
Change-Id: Idf5d93085f926cc4fbeba40cbe03684c49baab72
diff --git a/libprocessgroup/Android.bp b/libprocessgroup/Android.bp
index 618a5c5..69533d7 100644
--- a/libprocessgroup/Android.bp
+++ b/libprocessgroup/Android.bp
@@ -23,6 +23,10 @@
         "task_profiles.cpp",
     ],
     name: "libprocessgroup",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.os.statsd",
+    ],
     host_supported: true,
     native_bridge_supported: true,
     recovery_available: true,