Using buffer for weight tensors for quantized mat mul op.

Differential Revision: D87911255

Pull Request resolved: #15990

Author: trivedivivek

backends/vulkan/runtime/graph/ops/impl/Staging.cpp

@@ -285,7 +285,7 @@ ValueRef prepack_int4_linear_weight_transposed_interleaved(
   const int64_t N = qmat2_orig_sizes.at(ndim - 2);
   const int64_t N_div2 = N / int64_t(2);
 
-  utils::StorageType storage_type = utils::kTexture2D;
+  utils::StorageType storage_type = utils::kBuffer;
   uint32_t max_extent = graph.context()->adapter_ptr()->max_texture2d_dim();
   if (N_div2 > max_extent * 4 || K > max_extent) {
     storage_type = utils::kBuffer;