configs: ls1028a: enable CMD_DM

Since at least some of the drivers relevant to LS1028A are now following
DM, it's useful to have dm command enabled by default.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1028ardb_tfa_defconfig b/configs/ls1028ardb_tfa_defconfig
index eb52381..4ec7ed0 100644
--- a/configs/ls1028ardb_tfa_defconfig
+++ b/configs/ls1028ardb_tfa_defconfig
@@ -18,6 +18,7 @@
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0500 ramdisk_size=0x2000000 default_hugepagesz=2m hugepagesz=2m hugepages=256 video=1920x1080-32@60 cma=256M"
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_DM=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y