remove Documentation/mips/GT64120.README

Being related to 2.4 kernel, the information presented in the `Documentation/mips/GT64120.README' file is outdated. Worse, the document contents are plain misleading nowadays because the text mentions files and directories, which have been deleted, moved or restructured for 2.6.

In my opinion, this file should be deleted from the 2.6 kernel tree.

--

index 3f13bf8..8ae9cff 100644
@@ -2,5 +2,3 @@
 	- this file.
 AU1xxx_IDE.README
 	- README for MIPS AU1XXX IDE driver.
-GT64120.README
-	- README for dir with info on MIPS boards using GT-64120 or GT-64120A.