spi: spi-imx: Fix casting warnings

Sparse warnings:

drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:410:19: warning: cast to restricted __be32
drivers/spi/spi-imx.c:439:21: warning: incorrect type in assignment (different base types)
drivers/spi/spi-imx.c:439:21:    expected unsigned int [addressable] [usertype] val
drivers/spi/spi-imx.c:439:21:    got restricted __be32 [usertype]

Signed-off-by: Hardevsinh Palaniya <hardevsinh.palaniya@siliconsignals.io>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20241008055644.4900-3-hardevsinh.palaniya@siliconsignals.io
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Hardevsinh-Palaniya

drivers/spi/spi-imx.c

@@ -407,7 +407,7 @@ static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
 
 static void mx53_ecspi_rx_target(struct spi_imx_data *spi_imx)
 {
-	u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
+	u32 val = ioread32be(spi_imx->base + MXC_CSPIRXDATA);
 
 	if (spi_imx->rx_buf) {
 		int n_bytes = spi_imx->target_burst % sizeof(val);
@@ -436,13 +436,12 @@ static void mx53_ecspi_tx_target(struct spi_imx_data *spi_imx)
 	if (spi_imx->tx_buf) {
 		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
 		       spi_imx->tx_buf, n_bytes);
-		val = cpu_to_be32(val);
 		spi_imx->tx_buf += n_bytes;
 	}
 
 	spi_imx->count -= n_bytes;
 
-	writel(val, spi_imx->base + MXC_CSPITXDATA);
+	iowrite32be(val, spi_imx->base + MXC_CSPITXDATA);
 }
 
 /* MX51 eCSPI */