fix(drivers/mtd): macronix quad enable bit issue

Invert test logic on the status register control to
fix issue when the bit SR_QUAD_EN_MX is not set.

Change-Id: I8b2f140219f124336bf96462abf9d9445d0308bc
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
1 file changed