SWDEV-389689 - Rework oversubscription test to use threads instead of process. Also consider system memory when oversubscribing (#317)

Change-Id: If063552e9e2815f07e944259237310f6fef37ad5

catch/hipTestMain/config/config_amd_linux_common.json

@@ -55,7 +55,6 @@
 	   "Disabling test tracked SWDEV-391718",
 	   "Unit_hipMemRangeGetAttribute_TstCountParam",
 	   "Fails in Stress test SWDEV-398971",
-	   "Unit_HMM_OverSubscriptionTst",
 	   "SWDEV-398975 Seg faults in stress test",
 	   "Unit_hipMemcpyWithStream_MultiThread",
 	   "SWDEV-398977 fails in stress tests",