[CMake][Build]: Remove unused ACL CMake env variables (#30339)

Signed-off-by: Radu Salavat <radu.salavat@arm.com>

cmake/cpu_extension.cmake

@@ -251,17 +251,6 @@ if ((AVX512_FOUND AND NOT AVX512_DISABLED) OR (ASIMD_FOUND AND NOT APPLE_SILICON
         endif()
 
         # Build ACL with CMake
-        set(ARM_COMPUTE_BUILD_SHARED_LIB "OFF")
-        set(CMAKE_BUILD_TYPE "Release")
-        set(ARM_COMPUTE_ARCH "armv8.2-a")
-        set(ARM_COMPUTE_ENABLE_ASSERTS "OFF")
-        set(ARM_COMPUTE_ENABLE_CPPTHREADS "OFF")
-        set(ONEDNN_ENABLE_PRIMITIVE "MATMUL;REORDER")
-        set(ARM_COMPUTE_ENABLE_OPENMP "ON")
-        set(ARM_COMPUTE_ENABLE_WERROR "OFF")
-        set(ARM_COMPUTE_BUILD_EXAMPLES "OFF")
-        set(ARM_COMPUTE_BUILD_TESTING "OFF")
-
         set(_cmake_config_cmd
              ${CMAKE_COMMAND} -G Ninja -B build 
             -DARM_COMPUTE_BUILD_SHARED_LIB=OFF