kmp204x: enable support for SPANSION SPI NOR

The new prototype and the final series was moved from Micron to Spansion
to have a better reset sequence that is easier to support.
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/configs/km/kmp204x-common.h

@@ -302,6 +302,7 @@ int get_scl(void);
 #define CONFIG_SPI_FLASH
 #define CONFIG_SPI_FLASH_BAR	/* 4 byte-addressing */
 #define CONFIG_SPI_FLASH_STMICRO
+#define CONFIG_SPI_FLASH_SPANSION
 #define CONFIG_CMD_SF
 #define CONFIG_SF_DEFAULT_SPEED         20000000
 #define CONFIG_SF_DEFAULT_MODE          0