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>

pkgs/development/python-modules/labgrid/0001-serialdriver-remove-pyserial-version-check.patch

@@ -0,0 +1,33 @@
+From 75baa1751973378cb96fb204b0a18a74e5caa2d1 Mon Sep 17 00:00:00 2001
+From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
+Date: Wed, 17 Feb 2021 14:03:20 +0100
+Subject: [PATCH] serialdriver: remove pyserial version check
+
+This check isn't required on NixOS, since pyserial within NixOS already
+contains the patches.
+
+Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
+---
+ labgrid/driver/serialdriver.py | 6 ------
+ 1 file changed, 6 deletions(-)
+
+diff --git a/labgrid/driver/serialdriver.py b/labgrid/driver/serialdriver.py
+index 126f674e..59a92269 100644
+--- a/labgrid/driver/serialdriver.py
++++ b/labgrid/driver/serialdriver.py
+@@ -27,12 +27,6 @@ class SerialDriver(ConsoleExpectMixin, Driver, ConsoleProtocol):
+         bindings = {"port": "SerialPort", }
+     else:
+         bindings = {"port": {"SerialPort", "NetworkSerialPort"}, }
+-    if version.parse(serial.__version__) != version.Version('3.4.0.1'):
+-        message = ("The installed pyserial version does not contain important RFC2217 fixes.\n"
+-                   "You can install the labgrid fork via:\n"
+-                   "pip uninstall pyserial\n"
+-                   "pip install https://github.com/labgrid-project/pyserial/archive/v3.4.0.1.zip#egg=pyserial\n")  # pylint: disable=line-too-long
+-        warnings.warn(message)
+ 
+     txdelay = attr.ib(default=0.0, validator=attr.validators.instance_of(float))
+     timeout = attr.ib(default=3.0, validator=attr.validators.instance_of(float))
+-- 
+2.30.0
+