ARM: mvebu: db-88f6820-amc: enable SPI_FLASH_BAR

This board uses Micron N25Q256A SPI flash. Enable SPI_FLASH_BAR to allow
us to access the whole chip.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Cc: Vignesh R <vigneshr@ti.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/db-88f6820-amc_defconfig b/configs/db-88f6820-amc_defconfig
index f5d3522..319d9db 100644
--- a/configs/db-88f6820-amc_defconfig
+++ b/configs/db-88f6820-amc_defconfig
@@ -53,6 +53,7 @@
 CONFIG_NAND=y
 CONFIG_NAND_PXA3XX=y
 CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_PHY_MARVELL=y