EISW-163563 Permanently disable XeGPU dialect support

XeGPU is unsused in our pipeline, so this change disabled it cleanly to avoid unnecessary build overhead.

Author: sramasit

mlir/docs/Passes.md

@@ -119,7 +119,3 @@ This document describes the available MLIR passes and their contracts.
 ## TOSA Dialect Passes
 
 [include "TosaPasses.md"]
-
-## XeGPU Dialect Passes
-
-[include "XeGPUPasses.md"]

mlir/include/mlir/Dialect/CMakeLists.txt

@@ -44,4 +44,3 @@ add_subdirectory(UB)
 add_subdirectory(Utils)
 add_subdirectory(Vector)
 add_subdirectory(X86Vector)
-# add_subdirectory(XeGPU)