Use HIP_PATH if set else use relative ../...

samples/1_Utils/hipBusBandwidth/Makefile

@@ -1,4 +1,4 @@
-HIP_PATH=../../..
+HIP_PATH?=../../..
 HIPCC=$(HIP_PATH)/bin/hipcc
 
 EXE=hipBusBandwidth

samples/1_Utils/hipDispatchLatency/Makefile

@@ -1,4 +1,4 @@
-HIP_PATH=../../..
+HIP_PATH?=../../..
 HIPCC=$(HIP_PATH)/bin/hipcc
 
 EXE=hipDispatchLatency

samples/1_Utils/hipInfo/Makefile

@@ -1,4 +1,4 @@
-HIP_PATH=../../..
+HIP_PATH?=../../..
 HIPCC=$(HIP_PATH)/bin/hipcc
 
 EXE=hipInfo