sf: update sst25wf040b flash params

sst25wf040b doesn't support Auto Address Increment Programming command.
Remove SST_WR flag.

Signed-off-by: Haikun Wang <B53464@freescale.com>
Tested-by: Haikun Wang <haikun.wang@freescale.com>
Reviewed-by: Jagannadh Teki <jteki@openedev.com>