sf: spansion: Add support for S25FL128S

SPANSION recommend S25FL128S supersedes S25FL129P, and the two flash
memory have the same device ID and Memory architecture. So they can
use the same config parameters.

Signed-off-by: Xie Xiaobo <X.Xie@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>