Fix up and document the AMD CS5530/CS5530A support in flashrom.
The previous code was pretty unreadable, undocumented and did some totally
unrelated things (such as mucking with the game port or port 0x92).
This version is tested with a 256 KB chip and should work for the
CS5530 and CS5530A.
Signed-off-by: Uwe Hermann <email@example.com>
Acked-by: Stefan Reinauer <firstname.lastname@example.org>