mtd: spi: Drop SPI_XFER_MMAP*

These two defines are no-longer supported. Drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/spi.h b/include/spi.h
index 98ba9e7..ef8c1f6 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -146,8 +146,6 @@
 #define SPI_XFER_BEGIN		BIT(0)	/* Assert CS before transfer */
 #define SPI_XFER_END		BIT(1)	/* Deassert CS after transfer */
 #define SPI_XFER_ONCE		(SPI_XFER_BEGIN | SPI_XFER_END)
-#define SPI_XFER_MMAP		BIT(2)	/* Memory Mapped start */
-#define SPI_XFER_MMAP_END	BIT(3)	/* Memory Mapped End */
 };
 
 /**