board: ls1043ardb: Update MAINTAINERS

Update LS1043ARDB BOARD MAINTAINERS entries
to current MAINTAINERS.

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>

board/freescale/ls1043ardb/MAINTAINERS

@@ -10,10 +10,6 @@ F:	configs/ls1043ardb_nand_defconfig
 F:	configs/ls1043ardb_sdcard_defconfig
 F:	configs/ls1043ardb_tfa_defconfig
 F:	configs/ls1043ardb_tfa_SECURE_BOOT_defconfig
-
-LS1043A_SECURE_BOOT BOARD
-M:	Ruchika Gupta <ruchika.gupta@nxp.com>
-S:	Maintained
 F:	configs/ls1043ardb_SECURE_BOOT_defconfig
 F:	configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig
 F:	configs/ls1043ardb_nand_SECURE_BOOT_defconfig