arm: armada: configs: Move environment location for mvebu

Move the default environment location to the end of 4MB flash
region. This change allows to accomodate larger flash boot
images making space for forthcoming code changes.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/mvebu_db-88f3720_defconfig b/configs/mvebu_db-88f3720_defconfig
index a6bbe1a..95019b7 100644
--- a/configs/mvebu_db-88f3720_defconfig
+++ b/configs/mvebu_db-88f3720_defconfig
@@ -6,7 +6,7 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_TARGET_MVEBU_ARMADA_37XX=y
 CONFIG_ENV_SIZE=0x10000
-CONFIG_ENV_OFFSET=0x180000
+CONFIG_ENV_OFFSET=0x3f0000
 CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_DM_GPIO=y
 CONFIG_DEBUG_UART_BASE=0xd0012000