better transpose pattern and cleanup

src/PIM/Conversion/ONNXToSpatial/Patterns.cpp

@@ -10,6 +10,7 @@ void populatePrePatterns(RewritePatternSet& patterns, MLIRContext* ctx) { popula
 void populateConversionPatterns(RewritePatternSet& patterns, MLIRContext* ctx) {
   populateGeneratedConversionPatterns(patterns, ctx);
   populateElementwisePatterns(patterns, ctx);
+  populateMatMulRewritePatterns(patterns, ctx);
   populateGemmPatterns(patterns, ctx);
   populateConvPatterns(patterns, ctx);
   populatePoolPatterns(patterns, ctx);