spi: rzv2h-rspi: do not set SPI_TRANS_FAIL_IO

spi: rzv2h-rspi: do not set SPI_TRANS_FAIL_IO

Setting SPI_TRANS_FAIL_IO has no effect if the transfer completes in the
current context, as it is only handled when .transfer_one() returns > 0,
when the SPI core must wait for the SPI transfer to complete.

Do not set SPI_TRANS_FAIL_IO as we either return an error or 0, since we
do our own waiting.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Link: https://patch.msgid.link/20251201134229.600817-4-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>