mtd: st_spi_fsm: Update Macronix 'QE' configuration

Update the configuration of the Macronix 'QE' bit, such that
we only set or clear the bit if required.

Signed-off-by: Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
1 file changed