staging: fpga manager: add driver for socfpga fpga manager

Add driver to fpga manager framework to allow configuration
of FPGA in Altera SoCFPGA parts.

Signed-off-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>