Update on "[7/n][ET-VK] Support texture2D in etvk.copy_offset"

To use `copy_offset` with 2D textures in AHB experimentation.

Differential Revision: [D63905519](https://our.internmc.facebook.com/intern/diff/D63905519/)

[ghstack-poisoned]

Author: jorgep31415

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

@@ -116,7 +116,6 @@ void add_copy_channel_offset_node(
   std::string kernel_name = "copy_channel_offset";
   kernel_name.reserve(kShaderNameReserve);
   add_dtype_suffix(kernel_name, *t_out);
-  add_storage_type_suffix(kernel_name, *t_out);
 
   int32_t out_channels = dim_at<kChannel4D>(out_sizes);