Update libresoc-litex submodule

diff --git a/src/soc/litex/florent b/src/soc/litex/florent
index a3106935913b18140fdf3b85ce802a2e7566f49b..d1c6391d0c35d1b375e9f12253b2b9f9031e0c3c 160000 (submodule)
--- a/src/soc/litex/florent
+++ b/src/soc/litex/florent
@@ -1 +1 @@
-Subproject commit a3106935913b18140fdf3b85ce802a2e7566f49b
+Subproject commit d1c6391d0c35d1b375e9f12253b2b9f9031e0c3c