arm: ls102xa: Add QSPI boot support for LS1021AQDS/TWR board

This patch adds QSPI boot support for LS1021AQDS/TWR board.
The QSPI boot image need to be programmed into the QSPI flash
first. Then the booting will start from QSPI memory space.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/ls1021aqds/MAINTAINERS b/board/freescale/ls1021aqds/MAINTAINERS
index 962176b..7a704cf 100644
--- a/board/freescale/ls1021aqds/MAINTAINERS
+++ b/board/freescale/ls1021aqds/MAINTAINERS
@@ -7,3 +7,4 @@
 F:	configs/ls1021aqds_ddr4_nor_defconfig
 F:	configs/ls1021aqds_nor_SECURE_BOOT_defconfig
 F:	configs/ls1021aqds_sdcard_defconfig
+F:	configs/ls1021aqds_qspi_defconfig