spi: spi-imx: avoid unnecessary line continuations

This patch fixes the following checkpatch warning by removing the
trailing backslash:

| WARNING: Avoid unnecessary line continuations
| +       spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-3-mkl@pengutronix.de


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