ARM: socfpga: Add support for DENX MCV SoM and MCVEVK baseboard

Add support for the DENX MCV SoM and MCVEVK baseboard. The SoM contains
eMMC, DRAM, Altera Cyclone V SoC. The baseboard contains CAN ports, UART
ports, STMPE811 touchscreen controller, USB OTG port, ethernet port and
a lot of IO pins.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: Vince Bridgers <vbridgers2013@gmail.com>
Cc: Alan Tull <atull@altera.com>
Cc: Thor Thayer <tthayer@altera.com>
Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>