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/servers/mxisd/0001-gradle.patch

@@ -0,0 +1,22 @@
+--- a/build.gradle	2019-05-16 21:09:08.373112953 +0200
++++ b/build.gradle	2019-05-16 21:09:37.093114427 +0200
+@@ -72,7 +72,7 @@
+ 
+ buildscript {
+     repositories {
+-        jcenter()
++REPLACE
+     }
+ 
+     dependencies {
+@@ -81,9 +81,7 @@
+ }
+ 
+ repositories {
+-    jcenter()
+-    maven { url "https://kamax.io/maven/releases/" }
+-    maven { url "https://kamax.io/maven/snapshots/" }
++REPLACE
+ }
+ 
+ dependencies {