add pim.vmm verifier and fix vmm lowering

reuse code for subviews

src/PIM/Dialect/Pim/Pim.td

@@ -389,6 +389,7 @@ def PimVMMOp : PimOp<"vmm", [DestinationStyleOpInterface]> {
     }
   }];
 
+  let hasVerifier = 1;
   let assemblyFormat = [{
     `(` $input `,` $outputBuffer `)` attr-dict `:` `(` type($input) `,` type($outputBuffer) `)` `->` type($output)
   }];