board/ls2080ardb: Disable SD-related GPIO programming

Smart voltage translator is removed from LS2080ARDB/LS2088ARDB
RevF boards. It is only used on LS2081ARDB. Programming GPIO
is only required for LS2081ARDB.

Signed-off-by: Santan Kumar <santan.kumar@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
[YS: Revise commit message]
Reviewed-by: York Sun <york.sun@nxp.com>