Fix: disable memory sanitizer for quantized_matmul_op_for_hexagon_test.

Change: 137914787

tensorflow/core/kernels/hexagon/BUILD

@@ -30,6 +30,7 @@ tf_cc_test(
     name = "quantized_matmul_op_for_hexagon_test",
     size = "small",
     srcs = ["quantized_matmul_op_for_hexagon_test.cc"],
+    tags = ["nomsan"],  # http://b/32242946
     deps = [
         "//tensorflow/core:framework",
         "//tensorflow/core:protos_all_cc",