HIP Path default updated to ROCM_PATH (reorg path) (#592)

Updated default path for hip to ROCM_PATH (/opt/rocm instead of /opt/rocm/hip) as per new/current structure.

[ROCm/rccl commit: 2cb2f9493a]

projects/rccl/tools/MultiRank/Makefile

@@ -3,7 +3,7 @@
 # Set to where RCCL is installed
 RCCL_INSTALL=../../build/release
 
-HIP_PATH?= $(wildcard /opt/rocm/hip)
+HIP_PATH?= $(wildcard /opt/rocm)
 ifeq (,$(HIP_PATH))
 HIP_PATH=../../..
 endif