[U-Boot] : sf: spansion: Add support for S25FL128S

Hi,

Request for few details here.

I am not understanding why this is applied on tree, [even i din't see the applied note on mailing list, may be i am missing] I was asked Xie Xiaobo to send v2 fo updating the name to - .name = "S25FL129P_64K/S25FL128S", + .name = "S25FL129P_64K/S25FL128S_64K",

Even i sent a patch on be of Xie Xiaobo http://patchwork.ozlabs.org/patch/247607/

Any comments, was the notion i used on patch was wrong.

-- Thanks, Jagan.