Add RKNN test files (#639)

test/models.json

@@ -5375,6 +5375,20 @@
     "format":   "RKNN v1.3.0",
     "link":     "https://github.com/lutzroeder/netron/issues/639"
   },
+  {
+    "type":     "rknn",
+    "target":   "blazeface.rknn",
+    "source":   "https://github.com/lutzroeder/netron/files/8932892/blazeface.rknn.zip[blazeface.rknn]",
+    "format":   "RKNN v1.7.0",
+    "link":     "https://github.com/lutzroeder/netron/issues/639"
+  },
+  {
+    "type":     "rknn",
+    "target":   "ckpt_precompile_20.nb",
+    "source":   "https://github.com/lutzroeder/netron/files/8932893/ckpt_precompile_20.nb.zip[ckpt_precompile_20.nb]",
+    "format":   "RKNN OpenVX",
+    "link":     "https://github.com/lutzroeder/netron/issues/639"
+  },
   {
     "type":     "rknn",
     "target":   "det_monitor.nb",