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/applications/networking/firehol/firehol-uname-command.patch

@@ -0,0 +1,11 @@
+--- a/sbin/firehol
++++ b/sbin/firehol
+@@ -10295,7 +10295,7 @@
+ 	kmaj=$1
+ 	kmin=$2
+
+-	set -- $($UNAME_CMD -r)
++	set -- $("$UNAME_CMD" -r)
+ 	eval $kmaj=\$1 $kmin=\$2
+ }
+ kernel_maj_min KERNELMAJ KERNELMIN