spi: airoha: switch back to non-dma mode in the case of error

Current dirmap code does not switch back to non-dma mode in the case of
error. This is wrong.

This patch fixes dirmap read/write error path.

Fixes: a403997c ("spi: airoha: add SPI-NAND Flash controller driver")
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20251012121707.2296160-6-mikhail.kshevetskiy@iopsys.eu


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