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/ls102xa_pbi.cfg b/board/freescale/ls1021aiot/ls102xa_pbi.cfg
new file mode 100644
index 0000000..b5ac5e2
--- /dev/null
+++ b/board/freescale/ls1021aiot/ls102xa_pbi.cfg
@@ -0,0 +1,14 @@
+#PBI commands
+
+09570200 ffffffff
+09570158 00000300
+8940007c 21f47300
+
+#Configure Scratch register
+09ee0200 10000000
+#Configure alternate space
+09570158 00001000
+#Flush PBL data
+096100c0 000FFFFF
+
+09ea085c 00502880