drivers: fpga: Add FPGA configuration during bootm for Intel SOCFPGA

drivers: fpga: Add FPGA configuration during bootm for Intel SOCFPGA

Enabling the capability to automatically perform FPGA configuration
when booting Linux FIT image via bootm command. The FPGA
configuration bitstream shall be packed within the FIT image.

The FPGA data (full or partial) is checked by the SDM hardware,
for Intel SDM Mailbox based devices. Hence always return full
bitstream.

Second function is to enable the HPS to FPGA bridges when FPGA load
is completed successfully. This is to ensure the FPGA is accessible
by the HPS.

Signed-off-by: Muhammad Hazim Izzat Zamri <muhammad.hazim.izzat.zamri@altera.com>
Link: https://lore.kernel.org/r/20250314021953.18379-2-muhammad.hazim.izzat.zamri@altera.com
Signed-off-by: Michal Simek <michal.simek@amd.com>