Update idmap2_tests to really work host-side

idmap2_tests is marked host_supported:true but use
a AndroidTest.xml config that can only work for device.

Deleting the explict config to rely on the auto-gen ones.
Adding unit_tests:true to run in presubmit

Test: presubmit, atest idmap2_tests --host
Bug: 179092189
Change-Id: I0b325abc6ce7fc6c777d070bb0fc0e9e8a7cdedd

cmds/idmap2/Android.bp

@@ -132,9 +132,6 @@ cc_test {
         "tests/XmlParserTests.cpp",
         "tests/ZipFileTests.cpp",
     ],
-    required: [
-        "idmap2",
-    ],
     static_libs: ["libgmock"],
     target: {
         android: {
@@ -163,9 +160,19 @@ cc_test {
             shared_libs: [
                 "libz",
             ],
+            data: [
+                ":libz",
+                ":idmap2",
+            ],
         },
     },
-    data: ["tests/data/**/*.apk"],
+    data: [
+        "tests/data/**/*.apk",
+    ],
+    compile_multilib: "first",
+    test_options: {
+        unit_test: true,
+    },
 }
 
 cc_binary {

cmds/idmap2/AndroidTest.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2018 The Android Open Source Project
-
-     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.
--->
-<configuration description="Config for idmap2_tests">
-    <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
-        <option name="cleanup" value="true" />
-        <option name="push" value="idmap2_tests->/data/local/tmp/idmap2_tests" />
-    </target_preparer>
-    <option name="test-suite-tag" value="idmap2_tests" />
-    <test class="com.android.tradefed.testtype.GTest" >
-        <option name="native-test-device-path" value="/data/local/tmp" />
-        <option name="module-name" value="idmap2_tests" />
-    </test>
-</configuration>