kconfig: Convert FPGA and FPGA_ALTERA configuration to Kconfig

This converts the following to Kconfig:
   CONFIG_FPGA
   CONFIG_FPGA_ALTERA

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Dinh Nguyen <dinguyen@kernel.org>
5 files changed