Reland "Wifi apex: set min_sdk_version to 30"

This reverts commit e1f118822c9e6e402d62514f41340e6cade7a635.

Reason for revert: Relanding once b/173120275 is resolved.

Bug: 173120275
Bug: 171096530
Change-Id: I4c24373da7e889c22258161e3d21fe40f93ebca6
Test: compiles
diff --git a/service/apex/Android.bp b/service/apex/Android.bp
index e23d9cc..8a2f834 100644
--- a/service/apex/Android.bp
+++ b/service/apex/Android.bp
@@ -33,6 +33,7 @@
         "OsuLogin",
         "ServiceWifiResources",
     ],
+    min_sdk_version: "30",
 }
 
 filegroup {