Bump torchao to 02105d4 (v0.17.0-rc1) (pytorch#18567)

Update torchao to 02105d4 (v0.17.0-rc1) and add Torch cmake prefix path
for TorchAO build

The torchao submodule update introduces a find_package(Torch) call that
requires Torch's cmake config to be discoverable. Reuse the existing
add_torch_to_cmake_prefix_path() helper from tools/cmake/Utils.cmake to
fix the build.

Author: manuelcandales

CMakeLists.txt

@@ -846,6 +846,9 @@ if(EXECUTORCH_BUILD_KERNELS_TORCHAO)
   set(TORCHAO_ENABLE_ARM_NEON_DOT ON)
   set(TORCHAO_BUILD_KLEIDIAI ON)
 
+  # TorchAO requires find_package(Torch) for include dirs; add its cmake path.
+  add_torch_to_cmake_prefix_path()
+
   # TorchAO kernels look for EXECUTORCH_INCLUDE_DIRS
   if(DEFINED EXECUTORCH_INCLUDE_DIRS)
     message(FATAL_ERROR "EXECUTORCH_INCLUDE_DIRS is already defined")