x86: apl: Use struct spi_nor instead of struct spi_flash

This construct effectively uses struct spi_nor due to a #define in
spi-nor.h so we may as well use that struct here. This allows dtoc to
parse it correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/apollolake/spl.c

@@ -97,7 +97,7 @@ U_BOOT_DRIVER(winbond_w25q128fw) = {
 	.id		= UCLASS_SPI_FLASH,
 	.of_match	= apl_flash_ids,
 	.probe		= apl_flash_probe,
-	.priv_auto	= sizeof(struct spi_flash),
+	.priv_auto	= sizeof(struct spi_nor),
 	.ops		= &apl_flash_ops,
 };