SWDEV-299127 - Support External Mipmap

Support hipExternalMemoryGetMappedMipmappedArray().
Add ImageExternalBuffer to differiate ImageBuffer.
Currently we only support tiling_optimal mode as
vulkan driver doesn't provide tiling information.

Change-Id: I7e3524cdde53e4df9f728894bcebf4bd3f58d4d9

rocclr/device/pal/palmemory.cpp

@@ -181,6 +181,7 @@ bool Memory::create(Resource::MemoryType memType, Resource::CreateParams* params
         flags_ |= SubMemoryObject | (parent_->flags_ & HostMemoryDirectAccess);
         break;
       }
+      case Resource::ImageExternalBuffer:
       case Resource::ImageBuffer: {
         Resource::ImageBufferParams* view = reinterpret_cast<Resource::ImageBufferParams*>(params);
         parent_ = reinterpret_cast<const Memory*>(view->memory_);