Add minimal example JSON to test "gpu_fakedev" generator

Config file is suitably indented so that it can be directly
appended to a suitable configMap header.

Signed-off-by: Eero Tamminen <eero.t.tamminen@intel.com>

Author: eero-t

cmd/gpu_fakedev/configs/8x-DG1.json

@@ -0,0 +1,8 @@
+{
+	"Info": "8x 4 GiB DG1 [Iris Xe MAX Graphics] GPUs",
+	"DevCount": 8,
+	"DevMemSize": 4294967296,
+	"Capabilities": {
+		"platform": "fake_DG1",
+	}
+}