spi: spi-fsl-dspi: Simplify transfer counter handling

Simplify driver by avoiding counter wrapping by clearing transfer counter
on first SPI transfer per interrupt instead of tracking what it was before.

Signed-off-by: Esben Haabendal <[email protected]>
Acked-by: Martin Hundebøll <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
1 file changed