Update microdroid's built-in apexes

i18n apex is non-updatable and has no-hashtree in its payload image.
Without hashtree, apex can't be dm-verity mounted. So microroid should
have the apex as a built-in (in /system/apex) so that it can be directly
loop-mounted.

Bug: n/a
Test: MicrodroidHostTestCases
Change-Id: Iea5d9cd7b39e909259ed452258395cfb20804f70

microdroid/Android.bp

@@ -101,7 +101,10 @@ android_system_image {
     multilib: {
         common: {
             deps: [
+                // non-updatable & mandatory apexes
+                "com.android.i18n",
                 "com.android.runtime",
+
                 "microdroid_plat_sepolicy.cil",
                 "microdroid_plat_mapping_file",
             ],

virtualizationservice/src/payload.rs

@@ -31,8 +31,7 @@ use vmconfig::open_parcel_file;
 
 /// The list of APEXes which microdroid requires.
 // TODO(b/192200378) move this to microdroid.json?
-const MICRODROID_REQUIRED_APEXES: [&str; 3] =
-    ["com.android.adbd", "com.android.i18n", "com.android.os.statsd"];
+const MICRODROID_REQUIRED_APEXES: [&str; 2] = ["com.android.adbd", "com.android.os.statsd"];
 
 const APEX_INFO_LIST_PATH: &str = "/apex/apex-info-list.xml";