Allow hal_vibrator access to sysfs_vibrator files.

We already grant rw file access, but without dir search it's not much
use.

denied { search } for name="vibrator" dev="sysfs" ino=49606 scontext=u:r:hal_vibrator_default:s0 tcontext=u:object_r:sysfs_vibrator:s0 tclass=dir permissive=0

Bug: 72643420
Test: Builds, denial gone
Change-Id: I3513c0a14f0ac1e60517009046e2654f1fc45c66

public/hal_vibrator.te

@@ -6,3 +6,4 @@ allow hal_vibrator_client hal_vibrator_hwservice:hwservice_manager find;
 
 # vibrator sysfs rw access
 allow hal_vibrator sysfs_vibrator:file rw_file_perms;
+allow hal_vibrator sysfs_vibrator:dir search;