[ET-VK][ez] Fix vulkan_schema interface and link Vulkan to pybindings (pytorch#13327)

Summary:
## Changes

First, small update to `vulkan_schema` interface in the
`CMakeLists.txt`, which fixes a build error like:

```
  CMake Error in backends/vulkan/CMakeLists.txt:
    Target "vulkan_schema" INTERFACE_INCLUDE_DIRECTORIES property contains
    path:

      "/pytorch/executorch/pip-out/temp.linux-x86_64-cpython-310/cmake-out/schema/include"

    which is prefixed in the build directory.
```

Then, make the pybindings link against to the vulkan backend if it is
built. This allows model testing through Python via
`_load_for_executorch_from_buffer`.

Test Plan:
CI

cc @manuelcandales @cbilgin

---------

Co-authored-by: ssjia <[email protected]>

Author: SS-JIA

CMakeLists.txt

@@ -763,6 +763,10 @@ if(EXECUTORCH_BUILD_PYBIND)
     list(APPEND _dep_libs xnnpack_backend XNNPACK xnnpack-microkernels-prod)
   endif()
 
+  if(EXECUTORCH_BUILD_VULKAN)
+    list(APPEND _dep_libs vulkan_backend)
+  endif()
+
   # compile options for pybind
   set(_pybind_compile_options -Wno-deprecated-declarations -fPIC -frtti
                               -fexceptions

backends/vulkan/CMakeLists.txt

@@ -101,7 +101,7 @@ set_target_properties(vulkan_schema PROPERTIES LINKER_LANGUAGE CXX)
 target_include_directories(
   vulkan_schema
   INTERFACE
-    ${SCHEMA_INCLUDE_DIR}
+    $<BUILD_INTERFACE:${SCHEMA_INCLUDE_DIR}>
     $<BUILD_INTERFACE:${EXECUTORCH_ROOT}/third-party/flatbuffers/include>
 )
 

backends/vulkan/runtime/gen_vulkan_spv.py

@@ -1083,7 +1083,6 @@ def compile_spirv(shader_paths_pair) -> Tuple[str, str]:
             for spv_out_path, glsl_out_path in pool.map(
                 compile_spirv, self.output_file_map.items()
             ):
-                print(spv_to_glsl_map)
                 spv_to_glsl_map[spv_out_path] = glsl_out_path
 
         return spv_to_glsl_map