[Android] Build "all" on the clang and arm64 android builders.

testing/buildbot/chromium.linux.json

 {
   "Android Arm64 Builder (dbg)": {
     "additional_compile_targets": [
-      "gn_all"
+      "all"
     ]
   },
   "Android Builder": {
     "additional_compile_targets": [
       "cronet_test_instrumentation_apk",
       "system_webview_apk"
     ]
   },
   "Android Builder (dbg)": {
     "additional_compile_targets": [
       "system_webview_apk"
     ]
   },
   "Android Clang Builder (dbg)": {
     "additional_compile_targets": [
-      "gn_all"
-    ]
-  },
-  "Android GN": {},
-  "Android GN (dbg)": {
-    "additional_compile_targets": [
       "all"
     ]
   },
   "Android Tests": {
     "gtest_tests": [
       {
         "test": "android_webview_unittests"
       },
       {
         "test": "base_unittests"
@@ skipping 1774 matching lines @@
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       }
     ]
   }
 }