FPGA Manager changes for 5.16

The first patch adds Hao and Yilun as additional maintainers
for the FPGA Manager subsystem.

The second patch removes a now stale reference to a product specific
website that no longer reflects the FPGA Manager subsystem.

All patches have been reviewed on the mailing list, and have been in the
last few linux-next releases (as part of my for-next branch) without issues.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
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