Extract DeviceType to a standalone header file

Differential Revision: D75313723

Pull Request resolved: #11145

Author: desertfire

runtime/core/portable_type/c10/c10/targets.bzl

@@ -65,6 +65,7 @@ def define_common_targets():
         fbcode_exported_deps = ([
             "//caffe2:aten-headers-cpu",
             "//caffe2:generated-config-header",
+            "//caffe2:torch_standalone_headers",
             "//caffe2/c10:c10_headers",
         ] + select({
             "DEFAULT": [],
@@ -83,6 +84,7 @@ def define_common_targets():
         ] + get_sleef_preprocessor_flags(),
         xplat_exported_deps = [
             "//xplat/caffe2:aten_header",
+            "//xplat/caffe2:torch_standalone_headers",
             "//xplat/caffe2/c10:c10_headers",
         ] + ["//xplat/caffe2:ovrsource_aten_Config.h" if is_arvr_mode() else "//xplat/caffe2:generated_aten_config_header",],
         exported_preprocessor_flags = select({