dt: socfpga: Import and enable Arria V DK DTS

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 <[email protected]>
Cc: Chin Liang See <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Cc: Vince Bridgers <[email protected]>