[clang] [OpenCL] Allow undefining cl_khr_integer_dot_product features macros (PR #162055)

[Dr. Moritz Lehmann via cfe-commits]

ProjectPhysX wrote:

@wenju-he this does unfortunately not fix https://github.com/intel/compute-runtime/issues/817 as this PR is not applied to frozen Gen9 iGPUs.
It only fixes https://github.com/KhronosGroup/OpenCL-Docs/issues/1328#issuecomment-2741764348

https://github.com/llvm/llvm-project/pull/162055