uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/lib/test-script-prepend.py

@@ -0,0 +1,42 @@
+# This file contains type hints that can be prepended to Nix test scripts so they can be type
+# checked.
+
+from test_driver.driver import Driver
+from test_driver.vlan import VLan
+from test_driver.machine import Machine
+from test_driver.logger import Logger
+from typing import Callable, Iterator, ContextManager, Optional, List, Dict, Any, Union
+from typing_extensions import Protocol
+from pathlib import Path
+
+
+class RetryProtocol(Protocol):
+    def __call__(self, fn: Callable, timeout: int = 900) -> None:
+        raise Exception("This is just type information for the Nix test driver")
+
+
+class PollingConditionProtocol(Protocol):
+    def __call__(
+        self,
+        fun_: Optional[Callable] = None,
+        *,
+        seconds_interval: float = 2.0,
+        description: Optional[str] = None,
+    ) -> Union[Callable[[Callable], ContextManager], ContextManager]:
+        raise Exception("This is just type information for the Nix test driver")
+
+
+start_all: Callable[[], None]
+subtest: Callable[[str], ContextManager[None]]
+retry: RetryProtocol
+test_script: Callable[[], None]
+machines: List[Machine]
+vlans: List[VLan]
+driver: Driver
+log: Logger
+create_machine: Callable[[Dict[str, Any]], Machine]
+run_tests: Callable[[], None]
+join_all: Callable[[], None]
+serial_stdout_off: Callable[[], None]
+serial_stdout_on: Callable[[], None]
+polling_condition: PollingConditionProtocol