Revert disabling of context tracking for Radeon (#1927)

* Revert disabling of context tracking for Radeon

Original commit df3b7e47
 `Disable context tracking for the current version. (#1839)`

* Add env variable for disabling of context tracking for Radeon

`export NCCL_DISABLE_CONTEXT_TRACKING=1` to force disable of context tracking

* Update docs/how-to/rccl-usage-tips.rst

Fix grammar, thanks @amd-jnovotny

Co-authored-by: Jeffrey Novotny <jnovotny@amd.com>

* Rename NCCL_DISABLE_CONTEXT_TRACKING -> RCCL_DISABLE_CONTEXT_TRACKING

* Revert changes in includes and rename util function

---------

Co-authored-by: Jeffrey Novotny <jnovotny@amd.com>

[ROCm/rccl commit: 07925ec027]

projects/rccl/src/include/utils.h

@@ -68,6 +68,8 @@ inline ncclResult_t getRandomData(void* buffer, size_t bytes) {
   return ret;
 }
 
+bool rcclNeedEnableContextTrack(int cuDeviceId);
+
 ////////////////////////////////////////////////////////////////////////////////
 
 template<typename Int>