boards/km_arm: enable support for Macronix SPI NOR flash

The M25P80 and M25P32 SPI flashes from Numonix/Micron
will be replaced by Marconix MX25L80 and MX25L32 flashes.

Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
CC: Stefan Roese <sr@denx.de>
CC: Valentin Longchamp <valentin.longchamp@ch.abb.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/kmnusa_defconfig b/configs/kmnusa_defconfig
index 23599bc..1f2f1a6 100644
--- a/configs/kmnusa_defconfig
+++ b/configs/kmnusa_defconfig
@@ -48,6 +48,7 @@
 CONFIG_MTD_RAW_NAND=y
 CONFIG_SF_DEFAULT_SPEED=8100000
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_MV88E6352_SWITCH=y
 CONFIG_MVGBE=y
 CONFIG_MII=y