gpu-compute: Add methods to read GPU memory requestor ID

These methods are called from various places to override the requestor
ID of a request in order to determine which Ruby network a request
should be routed on.

Change-Id: Ic0270ddd7123f0457a13144e69ef9132204d4334
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/57651
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/gpu-compute/gpu_command_processor.cc

@@ -65,6 +65,15 @@ GPUCommandProcessor::hsaPacketProc()
     return *hsaPP;
 }
 
+/**
+ * Forward the VRAM requestor ID needed for device memory from GPU device.
+ */
+RequestorID
+GPUCommandProcessor::vramRequestorId()
+{
+    return gpuDevice->vramRequestorId();
+}
+
 TranslationGenPtr
 GPUCommandProcessor::translate(Addr vaddr, Addr size)
 {