board: freescale: ls1028a: mux changes for lpuart

mux changes in board file to enable lpuart1 and macro
define for lpuart1 used for mux changes in board configuation
register 13

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