allow recovery to run mke2fs tools

recovery exec /system/bin/{mke2fs,e2fsdroid} to format userdata

Bug: 35219933
Change-Id: I77e75c2dc55d4bea7984707f27bc215de186c4d1

public/recovery.te

@@ -29,6 +29,9 @@ recovery_only(`
   allow recovery unlabeled:filesystem ~relabelto;
   allow recovery contextmount_type:filesystem relabelto;
 
+  # Format ext4 filesystem
+  allow recovery e2fs_exec:file rx_file_perms;
+
   # Create and relabel files and directories under /system.
   allow recovery exec_type:{ file lnk_file } { create_file_perms relabelfrom relabelto };
   allow recovery { system_file }:{ file lnk_file } { create_file_perms relabelfrom relabelto };