tests: rework Kogge-Stone test consistently with Han-Carlson

tests/techmap/kogge-stone.tcl

@@ -0,0 +1,14 @@
+yosys -import
+
+read_verilog +/choices/kogge-stone.v
+read_verilog lcu_refined.v
+design -save init
+
+for {set i 1} {$i <= 16} {incr i} {
+    design -load init
+    chparam -set WIDTH $i
+    yosys proc
+    equiv_make -blacklist ppa.nomatch lcu _80_lcu_kogge_stone equiv
+    equiv_simple equiv
+    equiv_status -assert equiv
+}