sf: Fix quad bit set for micron devices

sf: Fix quad bit set for micron devices

Setting up quad bit for micron devices need to do the
same way as other flash devices like spansion, winbond
etc does using enhanced volatile config register so this
patch adds this support instead of printing "QEB is volatile"

Cc: Simon Glass <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: Peter Pan <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Siva Durga Prasad Paladugu <[email protected]>
Signed-off-by: Jagan Teki <[email protected]>