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/ls1021atwr/MAINTAINERS b/board/freescale/ls1021atwr/MAINTAINERS
index 2312e00..9176706 100644
--- a/board/freescale/ls1021atwr/MAINTAINERS
+++ b/board/freescale/ls1021atwr/MAINTAINERS
@@ -6,3 +6,4 @@
 F:	configs/ls1021atwr_nor_defconfig
 F:	configs/ls1021atwr_nor_SECURE_BOOT_defconfig
 F:	configs/ls1021atwr_sdcard_defconfig
+F:	configs/ls1021atwr_qspi_defconfig