Remove UPDATED_SYSTEM_APP from updated system apps no longer exist

This address an issue where getPkgState().isUpdatedSystemApp() remains
true even if the apk on /system is removed during OTA.

With this change, it sets updatedSystemApp to false when revoking
system privileges before re-scanning an apk on /data for updated
system apps no longer exist.

Bug: 265752747
Test: Manually tested
  1. Install an app on /product
  2. Update the app
  3. Delete the apk on /product and reboot
  4. Make sure FLAG_UPDATED_SYSTEM_APP removed
Change-Id: I9d9136ac19326599a20afd4710afdaf904572cb2

services/core/java/com/android/server/pm/InstallPackageHelper.java

@@ -3588,6 +3588,11 @@ final class InstallPackageHelper {
                 // remove the package from the system and re-scan it without any
                 // special privileges
                 mRemovePackageHelper.removePackage(pkg, true);
+                PackageSetting ps = mPm.mSettings.getPackageLPr(packageName);
+                if (ps != null) {
+                    ps.getPkgState().setUpdatedSystemApp(false);
+                }
+
                 try {
                     final File codePath = new File(pkg.getPath());
                     synchronized (mPm.mInstallLock) {