Fix sdram sim

Just need to add the RTL_SIM define

hw/super6502_fpga/src/sim/Makefile

@@ -10,6 +10,8 @@ TB_NAME=sim_top
 
 COPY_FILES=addr_map.mem init_hex.mem
 
+FLAGS=-DSIM -DRTL_SIM
+
 all: waves
 
 waves: $(TB_NAME)
@@ -25,4 +27,4 @@ $(COPY_FILES): ../../$@
 clean:
 	rm -rf $(COPY_FILES)
 	rm -rf $(TB_NAME)
-	rm -rf sim_top.vcd
+	rm -rf sim_top.vcd