disk_bfq: Use highest priority in BE class

diff --git a/src/frsh_forb b/src/frsh_forb
index 804eb2e2cfe0694efcdc0695e686ddfec21b531c..cb73d4e30db9346f0263f1752a07d3f7746bd5ce 160000 (submodule)
--- a/src/frsh_forb
+++ b/src/frsh_forb
@@ -1 +1 @@
-Subproject commit 804eb2e2cfe0694efcdc0695e686ddfec21b531c
+Subproject commit cb73d4e30db9346f0263f1752a07d3f7746bd5ce