Enable MSCCLPP use in CPX mode (#1355)

This PR enables the use of MSCCLPP in CPX mode for 8 GPUs.

[ROCm/rccl commit: d13f9c44f5]

projects/rccl/cmake/MSCCLPP.cmake

@@ -63,7 +63,10 @@ if(ENABLE_MSCCLPP)
                 WORKING_DIRECTORY ${MSCCLPP_SOURCE}
             )
         endif()
-        
+        execute_process(
+           COMMAND git apply ${CMAKE_CURRENT_SOURCE_DIR}/ext-src/cpx.patch
+           WORKING_DIRECTORY ${MSCCLPP_SOURCE}
+        ) 
         message(STATUS "Building mscclpp only for gfx942.")
         
         mscclpp_cmake_arg(CMAKE_PREFIX_PATH)

projects/rccl/ext-src/cpx.patch

@@ -0,0 +1,12 @@
+diff --git a/src/numa.cc b/src/numa.cc
+index d72c99e..16c903d 100644
+--- a/src/numa.cc
++++ b/src/numa.cc
+@@ -26,6 +26,7 @@ namespace mscclpp {
+ 
+ MSCCLPP_API_CPP int getDeviceNumaNode(int cudaDev) {
+   std::string busId = getBusId(cudaDev);
++  busId[busId.length() - 1] = '0';
+   std::string file_str = "/sys/bus/pci/devices/" + busId + "/numa_node";
+   std::ifstream file(file_str);
+   int numaNode;