NetworkStack: Explicitly set process name

Helps to share the process across other connectivity mainline modules
(regardless of whether com.android.networkstack or
com.google.android.networkstack is used).

com.android.networkstack.process is chosen to make sure it does not
conflict with package names of any APK.

Bug: 135691051
Test: Manual tests
 - Installed via adb on QP1A release build
 - manual connect to wifi networks
 - Remove networks
Change-Id: I314ed16cd36e08003f7c950896089fe6814c3db8
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index cace7e2..249e510 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -43,7 +43,8 @@
     <uses-permission android:name="android.permission.MAINLINE_NETWORK_STACK" />
     <application
         android:extractNativeLibs="false"
-        android:persistent="true">
+        android:persistent="true"
+        android:process="com.android.networkstack.process">
         <service android:name="com.android.server.NetworkStackService"
                  android:permission="android.permission.MAINLINE_NETWORK_STACK">
             <intent-filter>