ls1043ardb: Add missing config entries to MAINTAINERS

ls1043ardb_nand_defconfig and ls1043ardb_sdcard_defconfig are missing
in the MAINTAINERS file, so add them for completeness.

Reported-by: Albert Aribaud <albert.u.boot@aribaud.net>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Albert ARIBAUD <albert.u.boot@aribaud.net>

board/freescale/ls1043ardb/MAINTAINERS

@@ -5,3 +5,5 @@ F:	board/freescale/ls1043ardb/
 F:	board/freescale/ls1043ardb/ls1043ardb.c
 F:	include/configs/ls1043ardb.h
 F:	configs/ls1043ardb_defconfig
+F:	configs/ls1043ardb_nand_defconfig
+F:	configs/ls1043ardb_sdcard_defconfig