One macronix quad bit set using SR, it's good to
read back and check the written bit and also if
it's already been set check for the bit and return.

Cc: Vignesh R <vigneshr@ti.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Tested-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NJagan Teki <jteki@openedev.com>