ARM: socfpga_defconfig: enable fpga manager

Enable fpga manager framework and low level driver for
socfpga in socfpga_defconfig

Signed-off-by: Alan Tull <atull@opensource.altera.com>
Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>