[OpenCL] Add support for cslice partitioning (#7963)

Recently, an extension was added here:
#7513
This extension allows partitioning a device by "cslice" (aka CCS-es).
With this change, on PVC sub-sub-devices now require
info::partition_property::ext_intel_partition_by_cslice instead of
info::partition_property::partition_by_affinity_domain that wasn't quite
accurately describing the actual scheme.
Level Zero backend support was added here:
#7626
In this change, we are adding support in OpenCL plugin.

This change makes use of the cl_intel_command_queue_families recently
added.

Signed-off-by: Arvind Sudarsanam <arvind.sudarsanam@intel.com>

Author: asudarsa

sycl/plugins/opencl/CMakeLists.txt

@@ -10,12 +10,22 @@
 #TODO: Currently, the pi.h header is common between sycl and plugin library sources.
 #This can be changed by copying the pi.h file in the plugins project.
 
+find_package(Threads REQUIRED)
+
 add_sycl_plugin(opencl
   SOURCES
+    "../unified_runtime/pi2ur.hpp"
+    "../unified_runtime/pi2ur.cpp"
+    "../unified_runtime/ur/ur.hpp"
+    "../unified_runtime/ur/ur.cpp"
     "${sycl_inc_dir}/sycl/detail/pi.h"
     "pi_opencl.cpp"
+  INCLUDE_DIRS
+    ${CMAKE_CURRENT_SOURCE_DIR}/../unified_runtime # for Unified Runtime
   LIBRARIES
     OpenCL-ICD
+    Threads::Threads
+    UnifiedRuntime-Headers
 )
 
 set_target_properties(pi_opencl PROPERTIES LINKER_LANGUAGE CXX)