armv8: ls1028a: clean up the environment variables

Move the environment variables from command head file to
ls1028ardb specific head file so that they will not mess
up with ls1028aqds board.
Also updated some variable slightly.
There is no function change by this patch.

Signed-off-by: Yuantian Tang <andy.tang@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
2 files changed