Remove dead M-Systems Disk on Chip code

DOC support has been disabled by default for many years. The write function
does nothing but print text. It has a call to write_page_md2802() commented
out, but that function does not exist. This is dead code with ugly #ifdefs.

Updates README to reflect that there was a time when there was code, but it
didn't work. Removes M-Systems #defines and also includes svn rm msys_doc.*

Corresponding to flashrom svn r269 and coreboot v2 svn r3382.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
diff --git a/README b/README
index 7f16715..a3a0143 100644
--- a/README
+++ b/README
@@ -98,8 +98,10 @@
 Disk on Chip support
 --------------------
 
-Disk on Chip support is currently disabled since it is considered unstable.
-Change CFLAGS in the Makefile to enable it: Remove -DDISABLE_DOC from CFLAGS.
+Disk on Chip support was removed from flashrom in r3380. It had already
+been disabled by default in flashrom for several years because the code
+was considered unstable and incomplete. The products intended to work
+have been End-Of-Lifed by the manufacturer for a long time.
 
 
 Supported Flash Chips
@@ -113,7 +115,6 @@
 EMST F49B002UA
 Intel 82802AB (Firmware Hub) 
 Intel 82802AC (Firmware Hub) 
-M-Systems MD-2802 (unsupported, disabled by default)
 MX MX-29F002
 PMC PMC-49FL002
 PMC PMC-49FL004