Updated submodule: f4pga-arch-defs/third_party/f4pga-xc-fasm2bels

Signed-off-by: Abhishek Anand <abhishek.anand.nitdgp@gmail.com>

third_party/f4pga-xc-fasm2bels

diff --git a/third_party/f4pga-xc-fasm2bels b/third_party/f4pga-xc-fasm2bels
index 24d1e31..631939f 160000
--- a/third_party/f4pga-xc-fasm2bels
+++ b/third_party/f4pga-xc-fasm2bels
@@ -1 +1 @@
-Subproject commit 24d1e31ad8322ce48018ff0ef790103bd8450d66
+Subproject commit 631939fa4385ebc85d57da1b46a108bdbc8f0445