Add Fintek F71889 detection and dump support.

Add Fintek F71889 detection and dump support.

The patch was tested by a user on IRC who had the F71889FG. I
wrote it using documentation from Fintek's website available here:
http://www.fintek.com.tw/files/productfiles/F71889_V0.28P.pdf

This patch also seems to work for the F71889ED, which uses 0x09 and 0x09 for
chip ID bytes 1 & 2. However, I have not been able to find documentation to
verify that the two chips are identical from superiotool's perspective.

Signed-off-by: David Hendricks <dhendrix@google.com>
Signed-off-by: Alec Ari <neotheuser@ymail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6131 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1