smegw01: Add redundant environment support

Add redundant environment support as it is required
by SWUpdate.

While at it, place the CONFIG_ENV_OFFSET at 0x100000 to allow
more headroom.
Signed-off-by: NFabio Estevam <festevam@denx.de>

configs/smegw01_defconfig

@@ -4,11 +4,12 @@ CONFIG_NR_DRAM_BANKS=1
 CONFIG_SYS_MEMTEST_START=0x80000000
 CONFIG_SYS_MEMTEST_END=0xa0000000
 CONFIG_ENV_SIZE=0x2000
-CONFIG_ENV_OFFSET=0xC0000
+CONFIG_ENV_OFFSET=0x100000
 CONFIG_SYS_MALLOC_LEN=0x2300000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="imx7d-smegw01"
 CONFIG_TARGET_SMEGW01=y
+CONFIG_ENV_OFFSET_REDUND=0x110000
 CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
 # CONFIG_ARMV7_VIRT is not set
 CONFIG_IMX_RDC=y
@@ -35,6 +36,7 @@ CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_OVERWRITE=y
+CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_BOUNCE_BUFFER=y