Migrate from AndroidManifest to build.gradle for namespace

AGP has deprecated use of packageName in AndroidManifest and
instead wants everyone to use `android { namespace = "foo" }`
in build.gradle files.

Test: ./gradlew tasks -> still passes
Change-Id: I4fa03cacc7214011f3797c36dcb76c2984c7bf52
diff --git a/navigation/navigation-dynamic-features-runtime/build.gradle b/navigation/navigation-dynamic-features-runtime/build.gradle
index 347d0cf..8365a88 100644
--- a/navigation/navigation-dynamic-features-runtime/build.gradle
+++ b/navigation/navigation-dynamic-features-runtime/build.gradle
@@ -27,6 +27,7 @@
     defaultConfig {
         multiDexEnabled true
     }
+    namespace "androidx.navigation.dynamicfeatures"
 }
 
 dependencies {
diff --git a/navigation/navigation-dynamic-features-runtime/src/androidTest/AndroidManifest.xml b/navigation/navigation-dynamic-features-runtime/src/androidTest/AndroidManifest.xml
index e2f5533..f54cbb9 100644
--- a/navigation/navigation-dynamic-features-runtime/src/androidTest/AndroidManifest.xml
+++ b/navigation/navigation-dynamic-features-runtime/src/androidTest/AndroidManifest.xml
@@ -13,8 +13,7 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
   -->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="androidx.navigation.dynamicfeatures.test">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application>
         <uses-library android:name="android.test.runner" />
diff --git a/navigation/navigation-dynamic-features-runtime/src/main/AndroidManifest.xml b/navigation/navigation-dynamic-features-runtime/src/main/AndroidManifest.xml
index 43e353d..8f7e4bc 100644
--- a/navigation/navigation-dynamic-features-runtime/src/main/AndroidManifest.xml
+++ b/navigation/navigation-dynamic-features-runtime/src/main/AndroidManifest.xml
@@ -14,7 +14,6 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
   -->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="androidx.navigation.dynamicfeatures">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
 </manifest>