LPSPI peripheral driver supports pinctrl. Move twr_ke18f pinmux to use
pinmux for lpspi, and apply dynamic pinctrl states in order to select
correct chip select pin.
Also add pinmux settings to LPSPI for RT1060, so that LPSPI peripheral
driver will continue to work.
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
Add dts binding and pinctrl definition for flexio in twr_ke18f. This
allows ke18f pinmux code to apply pinctrl selections for flexio.
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>