sf: Fix s25fs512s id table

s25fs512s and s25fl512s_256k have common id information
till 5 bytes and 6th byte have different family id
like FS and FL-S as 0x81 and 0x80.

Reported-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Jagan Teki <jagan@openedev.com>