Forgot to add Spansion S25FL016A to README, trivial

Corresponding to flashrom svn r189 and coreboot v2 svn r3080.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Peter Stuge <peter@stuge.se>
diff --git a/README b/README
index 0ee4ba9..312304b 100644
--- a/README
+++ b/README
@@ -118,6 +118,7 @@
 PMC PMC-49FL002
 PMC PMC-49FL004
 Sharp LHF-00L04
+Spansion S25FL016A
 SST SST-29EE020A
 SST SST-28SF040A
 SST SST-39SF010A