allow QXDM search firmware dir

Bug: 111454905
Test: use QXDM and find the log working

Change-Id: I82cd89fa57c325a9866e48c518f8a9d49f932608
diff --git a/vendor/qcom/common/rfs_access.te b/vendor/qcom/common/rfs_access.te
index be7e18d..280ab02 100644
--- a/vendor/qcom/common/rfs_access.te
+++ b/vendor/qcom/common/rfs_access.te
@@ -8,6 +8,8 @@
 
 wakelock_use(rfs_access)
 
+r_dir_file(rfs_access, firmware_file);
+
 # For tftp server file access
 allow rfs_access mnt_vendor_file:dir search;
 allow rfs_access mnt_vendor_file:file r_file_perms;