Fixed error in makefile that was build all modules

Makefile

diff --git a/Makefile b/Makefile
index e787f93..eab7c0f 100644
--- a/Makefile
+++ b/Makefile
@@ -66,7 +66,7 @@
 blocks=$(shell cd openlane && find * -maxdepth 0 -type d)
 .PHONY: $(blocks)
 $(blocks):
-	export CARAVEL_ROOT=$(CARAVEL_ROOT) && cd openlane && $(MAKE) $*
+	export CARAVEL_ROOT=$(CARAVEL_ROOT) && cd openlane && $(MAKE) $@
 
 dv_patterns=$(shell cd verilog/dv && find * -maxdepth 0 -type d)
 dv-targets-rtl=$(dv_patterns:%=verify-%-rtl)