arm: socfpga: scan: Add code to get FPGA ID

arm: socfpga: scan: Add code to get FPGA ID

Add code to get the FPGA type for Altera's SoCFPGA family of FPGA. The code
uses the scan manager to send jtag pulses that will return the FPGA ID.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>