ls1046ardb: Add qspi_spl variant to the MAINTAINERS file

Signed-off-by: Tom Rini <trini@konsulko.com>

board/freescale/ls1046ardb/MAINTAINERS

@@ -5,6 +5,7 @@ F:	board/freescale/ls1046ardb/
 F:	board/freescale/ls1046ardb/ls1046ardb.c
 F:	include/configs/ls1046ardb.h
 F:	configs/ls1046ardb_qspi_defconfig
+F:	configs/ls1046ardb_qspi_spl_defconfig
 F:	configs/ls1046ardb_sdcard_defconfig
 F:	configs/ls1046ardb_emmc_defconfig