sf: Write quad bit along with read status

sf: Write quad bit along with read status

While setting quad bit on spansion, macronix code
is writing only particular quad bit this may give
wrong functionality with other register bits,
So this patch fix the issue where it with write
previous read reg status along  particular quad bit.

Cc: Vignesh R <[email protected]>
Cc: Mugunthan V N <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Siva Durga Prasad Paladugu <[email protected]>
Signed-off-by: Jagan Teki <[email protected]>