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/tools/security/notary/no-git-usage.patch

@@ -0,0 +1,15 @@
+diff --git a/Makefile b/Makefile
+index ab794165..0cbd047f 100644
+--- a/Makefile
++++ b/Makefile
+@@ -5,8 +5,8 @@ PREFIX?=$(shell pwd)
+ # Add to compile time flags
+ NOTARY_PKG := github.com/theupdateframework/notary
+ NOTARY_VERSION := $(shell cat NOTARY_VERSION)
+-GITCOMMIT := $(shell git rev-parse --short HEAD)
+-GITUNTRACKEDCHANGES := $(shell git status --porcelain --untracked-files=no)
++GITCOMMIT ?= $(shell git rev-parse --short HEAD)
++GITUNTRACKEDCHANGES :=
+ ifneq ($(GITUNTRACKEDCHANGES),)
+ GITCOMMIT := $(GITCOMMIT)-dirty
+ endif