Detect AMD GPU info via sysfs and block old cards

This wires up some new logic to start using sysfs to discover AMD GPU
information and detects old cards we can't yet support so we can fallback to CPU mode.

llm/generate/gen_linux.sh

@@ -21,7 +21,6 @@ amdGPUs() {
         return
     fi
     GPU_LIST=(
-        "gfx803"
         "gfx900"
         "gfx906:xnack-"
         "gfx908:xnack-"

llm/payload_common.go

@@ -90,6 +90,7 @@ func getDynLibs(gpuInfo gpu.GpuInfo) []string {
 	if len(dynLibs) == 0 {
 		dynLibs = []string{availableDynLibs["cpu"]}
 	}
+	slog.Debug(fmt.Sprintf("ordered list of LLM libraries to try %v", dynLibs))
 	return dynLibs
 }