spi: nxp_fspi: Enable support for nxp,imx8mm-fspi

The i.MX8M Mini can use the FlexSPI driver.  Add support
for it to the driver.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/spi/nxp_fspi.c b/drivers/spi/nxp_fspi.c
index 006dd04..012f304 100644
--- a/drivers/spi/nxp_fspi.c
+++ b/drivers/spi/nxp_fspi.c
@@ -320,6 +320,14 @@
 	.little_endian = true,  /* little-endian    */
 };
 
+static const struct nxp_fspi_devtype_data imx8mm_data = {
+	.rxfifo = SZ_512,       /* (64  * 64 bits)  */
+	.txfifo = SZ_1K,        /* (128 * 64 bits)  */
+	.ahb_buf_size = SZ_2K,  /* (256 * 64 bits)  */
+	.quirks = 0,
+	.little_endian = true,  /* little-endian    */
+};
+
 struct nxp_fspi {
 	struct udevice *dev;
 	void __iomem *iobase;
@@ -985,6 +993,7 @@
 
 static const struct udevice_id nxp_fspi_ids[] = {
 	{ .compatible = "nxp,lx2160a-fspi", .data = (ulong)&lx2160a_data, },
+	{ .compatible = "nxp,imx8mm-fspi", .data = (ulong)&imx8mm_data, },
 	{ }
 };