spi: fix: Call mxs_reset_block() during DM/DTS probe

Without this change the DM/DTS version of mxs_spi driver doesn't reset the
SPI IP block in probe.
As a result this driver (when used solely on U-Boot proper) relies on reset
performed by mxs spi driver in SPL.

In the use case where eMMC is used in SPL as a boot primary device, the
mxs_reset_block() is not called at all and DM/DTS aware SPI driver in
U-Boot proper is malfunctioning.
Signed-off-by: NLukasz Majewski <lukma@denx.de>

drivers/spi/mxs_spi.c

@@ -436,6 +436,8 @@ static int mxs_spi_probe(struct udevice *bus)
 	priv->dma_channel = plat->dma_id;
 	priv->clk_id = plat->clk_id;
 
+	mxs_reset_block(&priv->regs->hw_ssp_ctrl0_reg);
+
 	ret = mxs_dma_init_channel(priv->dma_channel);
 	if (ret) {
 		printf("%s: DMA init channel error %d\n", __func__, ret);