Update LM32 submodule

diff --git a/verilog/lm32/submodule b/verilog/lm32/submodule
index cf2281b28e42c99ea9ed17fb2195608df24c1f89..4c0f6c51253b4482fe7685e77d4d5549207a098c 160000 (submodule)
--- a/verilog/lm32/submodule
+++ b/verilog/lm32/submodule
@@ -1 +1 @@
-Subproject commit cf2281b28e42c99ea9ed17fb2195608df24c1f89
+Subproject commit 4c0f6c51253b4482fe7685e77d4d5549207a098c