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/arch/arm/Kconfig b/arch/arm/Kconfig
index d7a9b11..9d4d742 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -761,6 +761,20 @@
 	select ARCH_SUPPORT_PSCI
 	select LS1_DEEP_SLEEP
 
+config TARGET_LS1021AIOT
+	bool "Support ls1021aiot"
+	select CPU_V7
+	select CPU_V7_HAS_NONSEC
+	select CPU_V7_HAS_VIRT
+	select SUPPORT_SPL
+	select ARCH_LS1021A
+	select ARCH_SUPPORT_PSCI
+	help
+	  Support for Freescale LS1021AIOT platform.
+	  The LS1021A Freescale board (IOT) is a high-performance
+	  development platform that supports the QorIQ LS1021A
+	  Layerscape Architecture processor.
+
 config TARGET_LS1043AQDS
 	bool "Support ls1043aqds"
 	select ARCH_LS1043A
@@ -962,6 +976,7 @@
 source "board/freescale/ls1021aqds/Kconfig"
 source "board/freescale/ls1043aqds/Kconfig"
 source "board/freescale/ls1021atwr/Kconfig"
+source "board/freescale/ls1021aiot/Kconfig"
 source "board/freescale/ls1046aqds/Kconfig"
 source "board/freescale/ls1043ardb/Kconfig"
 source "board/freescale/ls1046ardb/Kconfig"