arm: mvebu: db-mv784mp-gp_defconfig: Enable CONFIG_BLK

This patch enables CONFIG_BLK as this is now possible with the recent
DM conversion of the Armada XP SATA driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
diff --git a/configs/db-mv784mp-gp_defconfig b/configs/db-mv784mp-gp_defconfig
index 98e47ee..078bd23 100644
--- a/configs/db-mv784mp-gp_defconfig
+++ b/configs/db-mv784mp-gp_defconfig
@@ -46,6 +46,7 @@
 CONFIG_ENV_SPI_MAX_HZ=50000000
 CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_SATA_MV=y
+CONFIG_BLK=y
 # CONFIG_MMC is not set
 CONFIG_NAND=y
 CONFIG_NAND_PXA3XX=y