x230: sources: remove external microcode update patch

As of commit

   e397f55702 3rdparty/blobs: Update submodule marker for Intel microcode updates

this is all included. yay.

x230/README.md

@@ -11,10 +11,10 @@
 That's the preferred way to use coreboot. The git revision we use is always included in the release.
 
 ### Intel microcode
-* revision `1f` from 2018-02-07 (Intel package [20180312](https://downloadcenter.intel.com/download/27591) not yet in coreboot upstream) under [Intel's license](LICENSE.microcode)
+* revision `1f` from 2018-02-07 see package [20180312](https://downloadcenter.intel.com/download/27591) under [Intel's license](LICENSE.microcode)
 
 ### SeaBIOS
-* version [1.11.1](https://seabios.org/Releases) from 2018-03-19 (part of coreboot upstream)
+* version [1.11.1](https://seabios.org/Releases) from 2018-03-19
 
 ## table of contents
 * [TL;DR](#tl-dr)

x230/sources/PATCHES.md

@@ -1,6 +1,4 @@
 This describes patches we apply to coreboot's master branch for building
 our release image:
 
-* Intel microcode update:
-
-	git pull https://review.coreboot.org/blobs refs/changes/63/25363/5
+	(currently no changes to coreboot's master branch)