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>

README

@@ -118,6 +118,7 @@ MX MX-29F002
 PMC PMC-49FL002
 PMC PMC-49FL004
 Sharp LHF-00L04
+Spansion S25FL016A
 SST SST-29EE020A
 SST SST-28SF040A
 SST SST-39SF010A