arch: arm64: intel: create dts to support FPGA GPIO and SGMII on Agilex NAND flash platform

Create dts files to support FPGA GPIO and SGMII features on Agilex
NAND flash platform.

Signed-off-by: Meng Li <Meng.Li@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>