gpu-compute,dev-hsa: Update CP and HSAPP for full-system

Make the necessary changes to connect Vega pagetable walkers for
full-system mode. Previously the CP and HSA packet processor could only
read AQL packets from system/host memory using proxy port. This allows
for AQL to be read from device memory which is used for non-blit
kernels.

Change-Id: If28eb8be68173da03e15084765e77e92eda178e9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53077
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.hh

@@ -77,6 +77,7 @@ class GPUCommandProcessor : public DmaVirtDevice
 
     HSAPacketProcessor& hsaPacketProc();
 
+    void setGPUDevice(AMDGPUDevice *gpu_device);
     void setShader(Shader *shader);
     Shader* shader();
     GPUComputeDriver* driver();
@@ -128,6 +129,8 @@ class GPUCommandProcessor : public DmaVirtDevice
     Shader *_shader;
     GPUDispatcher &dispatcher;
     GPUComputeDriver *_driver;
+    AMDGPUDevice *gpuDevice;
+    VegaISA::Walker *walker;
 
     // Typedefing dmaRead and dmaWrite function pointer
     typedef void (DmaDevice::*DmaFnPtr)(Addr, int, Event*, uint8_t*, Tick);