net: fm: fix spi flash probe for using driver model

The current code would always use the speed and mode set by
CONFIG_ENV_SPI_MAX_HZ and CONFIG_ENV_SPI_MODE. But if using
SPI driver model it should get the values from DT.

Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <york.sun@nxp.com>
1 file changed