[UR][L0] Remove Driver Exp Implementation of External Semaphore

[nrspruit]

• Intel L0 GPU Driver no longer supports the Driver Exp Implementation of External Semaphore and the code has been removed from the codebase, therefore the support needs to be removed from the adapter to allow compiling with newer ze_intel_gpu.h headers.
• L0 Spec implementation is the only version required for customer support.

[nrspruit]

@intel/bindless-images-reviewers please review

[przemektmalon]

@intel/bindless-images-reviewers please review

A short PR description would be useful here. Why were two implementations required before? And why is only one required now?

[nrspruit]

@intel/bindless-images-reviewers please review

A short PR description would be useful here. Why were two implementations required before? And why is only one required now?

@intel/bindless-images-reviewers please review

A short PR description would be useful here. Why were two implementations required before? And why is only one required now?

Hello @przemektmalon , the driver experimental version was the initial implementation until the L0 spec had the support officially. Now that the L0 gpu driver supports the L0 spec version, the Driver Experimental version was deleted from the code base in the gpu driver and the definitions of the driver experimental external semaphore functions and structures no longer exist. We have to remove the usage of the old driver exp code otherwise the code will not compile if one updates the ze_intel_gpu.h headers used.

[nrspruit]

@intel/llvm-gatekeepers , please merge