Set the minSdkVersion for the AdMob resources, as otherwise a lint error may occur

PiperOrigin-RevId: 274031399

Author: a-maurice

android_build_files/AndroidManifest-internet.xml renamed to admob/admob_resources/AndroidManifest.xml

@@ -2,4 +2,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.google.FirebaseCppSdkBuild">
   <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-sdk android:minSdkVersion="3"/>
 </manifest>

admob/admob_resources/build.gradle

@@ -36,9 +36,7 @@ android {
 
   sourceSets {
     main {
-      // Use the manifest that gives access to the internet, as some of the
-      // AdMob classes have linter problems without it.
-      manifest.srcFile '../../android_build_files/AndroidManifest-internet.xml'
+      manifest.srcFile 'AndroidManifest.xml'
       java {
         srcDirs = ['../src_java/com/google/firebase/admob/internal/cpp']
       }