sync cla-sysrepo

This detects some silent data corruption over UARTs when the HW RX FIFO
overruns. My working theory is that this is related to some excessive
CPU load, but I have no data for that (and `perf` is still hosed).

Change-Id: I8fdb4fee60e65daf6756e72ad2d85fd62216bae5
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/cla-sysrepo/+/6800
diff --git a/submodules/cla-sysrepo b/submodules/cla-sysrepo
index 9039a52..4f4c472 160000
--- a/submodules/cla-sysrepo
+++ b/submodules/cla-sysrepo
@@ -1 +1 @@
-Subproject commit 9039a526b5ff056de353830f54ac0a6327b11d0b
+Subproject commit 4f4c4726b654e6a5dea572ff31dd622dba62b4ed