sepolicy: Move adb_root binary to system_ext

Change-Id: Iaa82e245399a000ca05557b5268147f847f51eca
diff --git a/common/private/file_contexts b/common/private/file_contexts
index 6fdf6bf..1b2fb20 100644
--- a/common/private/file_contexts
+++ b/common/private/file_contexts
@@ -7,7 +7,7 @@
 /system/bin/backuptool_postinstall\.sh            u:object_r:otapreopt_chroot_exec:s0
 
 # ADB Root
-/system/bin/adb_root       u:object_r:adbroot_exec:s0
+/(system_ext|system/system_ext)/bin/adb_root      u:object_r:adbroot_exec:s0
 /data/adbroot(/.*)?        u:object_r:adbroot_data_file:s0
 
 # Bash