dt: socfpga: Import and enable Arria V DK DTS

Import DTS for Arria V development kit and enable support
for DT. The DT is imported from Linux 3.19-rc1 as of commit
97bf6af1f928216fd6c5a66e8a57bfa95a659672 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Vince Bridgers <vbridger@opensource.altera.com>
diff --git a/configs/socfpga_arria5_defconfig b/configs/socfpga_arria5_defconfig
index f290042..f152e9d 100644
--- a/configs/socfpga_arria5_defconfig
+++ b/configs/socfpga_arria5_defconfig
@@ -1,3 +1,5 @@
 CONFIG_SPL=y
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SOCFPGA_ARRIA5=y
+CONFIG_OF_CONTROL=y
+CONFIG_DEFAULT_DEVICE_TREE="socfpga_arria5_socdk"