SWDEV-467263 - Allow hipMalloc to use sys memory

PAL supports allocating from system memory once device memory is used up
or allocation is larger than the device memory.

Change-Id: Iccd3377e95a6cc6d23e45d4738a17af8b9ee32d7

hipamd/src/hip_memory.cpp

@@ -314,8 +314,11 @@ hipError_t ihipMalloc(void** ptr, size_t sizeBytes, unsigned int flags)
   const auto& dev_info = amdContext->devices()[0]->info();
   hip::getCurrentDevice()->SetActiveStatus();
 
-  if ((!useHostDevice && (dev_info.maxMemAllocSize_ < sizeBytes)) ||
-      (useHostDevice && (dev_info.maxPhysicalMemAllocSize_ < sizeBytes))) {
+  if (dev_info.maxPhysicalMemAllocSize_ < sizeBytes) {
+    return hipErrorOutOfMemory;
+  }
+  // PAL allocates from system memory if needed
+  if (IS_LINUX && !useHostDevice && (dev_info.maxMemAllocSize_ < sizeBytes)) {
     return hipErrorOutOfMemory;
   }