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/configs/ls1021aqds_qspi_defconfig b/configs/ls1021aqds_qspi_defconfig
new file mode 100644
index 0000000..05ec8e6
--- /dev/null
+++ b/configs/ls1021aqds_qspi_defconfig
@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="QSPI_BOOT"
++S:CONFIG_ARM=y
++S:CONFIG_TARGET_LS1021AQDS=y