armv7: Add support of ls1021a-iot board

The patch adds support for Freescale ls1021a-iot board.

Signed-off-by: Feng Li <feng.li_2@nxp.com>
[YS: rewrite commit message, fix whitespace in Kconfig]
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1021aiot/MAINTAINERS b/board/freescale/ls1021aiot/MAINTAINERS
new file mode 100644
index 0000000..2dab798
--- /dev/null
+++ b/board/freescale/ls1021aiot/MAINTAINERS
@@ -0,0 +1,7 @@
+LS1021AIOT BOARD
+M:	Feng Li <feng.li_2@nxp.com>
+S:	Maintained
+F:	board/freescale/ls1021aiot/
+F:	include/configs/ls1021aiot.h
+F:	configs/ls1021aiot_sdcard_defconfig
+F:	configs/ls1021aiot_qspi_defconfig