gpu-compute: Gfx version check for FS and SE mode

There is no GPU device in SE mode to get version from and no GPU driver
in FS mode to get version from, so a conditional needs to be added
depending on the mode to get the gfx version.

Change-Id: I33fdafb60d351ebc5148e2248244537fb5bebd31
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71078
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>

src/gpu-compute/gpu_command_processor.cc

@@ -227,9 +227,11 @@ GPUCommandProcessor::submitDispatchPkt(void *raw_pkt, uint32_t queue_id,
 
     DPRINTF(GPUKernelInfo, "Kernel name: %s\n", kernel_name.c_str());
 
+    GfxVersion gfxVersion = FullSystem ? gpuDevice->getGfxVersion()
+                          : driver()->getGfxVersion();
     HSAQueueEntry *task = new HSAQueueEntry(kernel_name, queue_id,
         dynamic_task_id, raw_pkt, &akc, host_pkt_addr, machine_code_addr,
-        gpuDevice->getGfxVersion());
+        gfxVersion);
 
     DPRINTF(GPUCommandProc, "Task ID: %i Got AQL: wg size (%dx%dx%d), "
         "grid size (%dx%dx%d) kernarg addr: %#x, completion "