SWDEV-279657 - Fix hipMallocManaged-N256M failure

Add concurrentManagedAccess detection in hipMallocManaged test.
Skip test when device doesn't support concurrentManagedAccess.

Change-Id: Ie54046feef3baba857a7068972ec1fc1a60c2dfd

hipamd/include/hip/nvidia_detail/hip_runtime_api.h

@@ -1561,6 +1561,9 @@ inline static hipError_t hipDeviceGetAttribute(int* pi, hipDeviceAttribute_t att
         case hipDeviceAttributeCooperativeMultiDeviceLaunch:
             cdattr = cudaDevAttrCooperativeMultiDeviceLaunch;
             break;
+        case hipDeviceAttributeConcurrentManagedAccess:
+            cdattr = cudaDevAttrConcurrentManagedAccess;
+            break;
         default:
             return hipCUDAErrorTohipError(cudaErrorInvalidValue);
     }