[RESEND PATCH v13 5/6] fpga: dfl: add support for N3000 Nios private feature

This patch adds support for the Nios handshake private feature on Intel PAC (Programmable Acceleration Card) N3000. The Nios is the embedded processor on the FPGA card. This private feature provides a handshake interface to FPGA Nios firmware, which receives retimer configuration command from host

[PATCH v13 5/6] fpga: dfl: add support for N3000 Nios private feature

This patch adds support for the Nios handshake private feature on Intel PAC (Programmable Acceleration Card) N3000. The Nios is the embedded processor on the FPGA card. This private feature provides a handshake interface to FPGA Nios firmware, which receives retimer configuration command from host