Implement com.dsi.ant hidl client.

Changes the hal service to be a hidl client instead of using
libantradio.so. This is part of the changes needed to support
project treble.

Some config variables have also been moved into an xml
resource. This allows vendors to customize behaviour using an
overlay rather than modifying the hal service source.
diff --git a/proguard.nolog.flags b/proguard.nolog.flags
new file mode 100644
index 0000000..452642f
--- /dev/null
+++ b/proguard.nolog.flags
@@ -0,0 +1,25 @@
+###############################################################################
+#
+# ANT Stack
+#
+# Copyright 2018 Dynastream Innovations
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+###############################################################################
+
+# Strip out any verbose/debug logs.
+-assumenosideeffects class android.util.log {
+    public static int v(...);
+    public static int d(...);
+}