Remove targets.xnnpack_dynamic_quant_utils from cmake_deps.toml (#3999)

Summary:
The only reference to this was removed in
#2585

Pull Request resolved: #3999

Test Plan:
- CI
- `./install_requirements.sh --pybind xnnpack` built successfully

Reviewed By: mcr229

Differential Revision: D58686093

Pulled By: dbort

fbshipit-source-id: b0e7c7092ea47468d6a5cd8c241f53a1ee4bf301

Author: dbort

build/cmake_deps.toml

@@ -262,14 +262,6 @@ deps = [
   "executorch_no_prim_ops",
 ]
 
-[targets.xnnpack_dynamic_quant_utils]
-buck_targets = [
-  "//backends/xnnpack:dynamic_quant_utils",
-]
-filters = [
-  ".cpp$",
-]
-
 [targets.xnnpack_schema]
 buck_targets = [
   "//backends/xnnpack/serialization:xnnpack_flatbuffer_header",