Allow dexopt_chroot_setup to mount on vendor_configs_file.

dexopt_chroot_setup needs to bind-mount the old /vendor/etc because the
old libraries expect it.

Bug: 379207007
Change-Id: If9acd29694cbde1fd680fc2f9000f1a22a346b09
Test: OTA from AP3A.241105.010 (24Q3) to BP2A.250107.003 (25Q2)
Test: OTA from ZP1A.241025.003 (incompatible build) to BP2A.250107.003 (25Q2)
diff --git a/private/dexopt_chroot_setup.te b/private/dexopt_chroot_setup.te
index 9e98bae..b4b35dd 100644
--- a/private/dexopt_chroot_setup.te
+++ b/private/dexopt_chroot_setup.te
@@ -76,6 +76,7 @@
   system_file
   system_lib_file
   tmpfs
+  vendor_configs_file
   vendor_file
 }:dir mounton;