spi: atmel: Drop unused defines

These defines are leftovers from previous versions of the blamed commit,
they are simply unused so drop them.

Fixes: e0205d62 ("spi: atmel: Prevent false timeouts on long transfers")
Reported-by: Ronald Wahl <ronald.wahl@raritan.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20231127095842.389631-2-miquel.raynal@bootlin.com


Signed-off-by: Mark Brown <broonie@kernel.org>