drivers: spi: nrf: fix async cs deactivation

Chip Select signal must be deactivated only after transaction
is finalized. In async case this means it cannot be done from
`transceive` call context, as this context is left as soon as
transfer is initialized.

Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
1 file changed