`CL_ME_VERSION_LEGACY_INTEL` is missing from spec

In `cl.xml`:
```





```
The other 2 are defined here as possible return values for `clGetDeviceInfo` with `CL_DEVICE_ME_VERSION_INTEL`:
https://registry.khronos.org/OpenCL/extensions/intel/cl_intel_advanced_motion_estimation.txt

Open cl.xml and inspect the require block for CL_DEVICE_ME_VERSION_INTEL, then compare its enum entries with the Intel advanced motion estimation extension specification. Done means CL_ME_VERSION_LEGACY_INTEL is defined alongside the two existing return values and the documentation build or validation passes.

Written by the indexing model from the issue text.