reduce store buffer size to reduce gate count

Since #1349 the store buffer can be reduced (I cross the fingers)

core/include/cv32a6_embedded_config_pkg.sv

@@ -48,7 +48,7 @@ package cva6_config_pkg;
     localparam CVA6ConfigDcacheIdWidth = 1;
     localparam CVA6ConfigMemTidWidth = 2;
 
-    localparam CVA6ConfigWtDcacheWbufDepth = 2;
+    localparam CVA6ConfigWtDcacheWbufDepth = 1;
 
     localparam CVA6ConfigNrCommitPorts = 1;
     localparam CVA6ConfigNrScoreboardEntries = 4;