gateware/cores: Update USB core

Mostly to get firmware code improvement and fixes

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ifacacd15f989aa51c04433cfb0bdaee7f848b658
diff --git a/gateware/cores/no2usb b/gateware/cores/no2usb
index 0e940d4..e9d1fbb 160000
--- a/gateware/cores/no2usb
+++ b/gateware/cores/no2usb
@@ -1 +1 @@
-Subproject commit 0e940d4da592cd27c351de2a4c5639f391d86b4d
+Subproject commit e9d1fbb8a1796444091cd8a39e2a4318530b4daf