mtd: simplify CONFIG_DM_SPI_FLASH dependencies

CONFIG_DM_SPI depends on CONFIG_DM. There is no need to list CONFIG_DM
explicitly as dependency for CONFIG_DM_SPI_FLASH

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Link: https://lore.kernel.org/r/20240604044039.27795-1-heinrich.schuchardt@canonical.com
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index bedc4e9..63b0fd8 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -2,7 +2,7 @@
 
 config DM_SPI_FLASH
 	bool "Enable Driver Model for SPI flash"
-	depends on DM && DM_SPI
+	depends on DM_SPI
 	imply SPI_FLASH
 	help
 	  Enable driver model for SPI flash. This SPI flash interface