ARM: socfpga: updates for socfpga_defconfig

This patch enables the following in the
socfpga_defconfig:

+CONFIG_OF_OVERLAY=y
  Enable support for Device Tree Overlays

+CONFIG_FPGA_REGION=y
  Enable device tree overlay support for FPGA
  programming

+CONFIG_FPGA_MGR_SOCFPGA_A10=y
  Enable partial reconfiguration for Altera
  Arria 10 FPGA

+CONFIG_FPGA_BRIDGE=y
  Enable the FPGA Bridges framework

+CONFIG_SOCFPGA_FPGA_BRIDGE=y
  Enable support for SoCFPGA hardware
  bridges

+CONFIG_ALTERA_FREEZE_BRIDGE=y
  Enable support for the Altera Soft IP
  Freeze bridges

Signed-off-by: Alan Tull <atull@opensource.altera.com>