First set of FPGA Manager changes for 5.11-rc1

This is the first set of changes for the FPGA Manager 5.11-rc1
mergewindow.

Core:
- Simplify registration of FPGA Manager drivers by providing a devres
  based API, that removes the need to call fpga_mgr_unregister() in
  every single driver.

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

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

iIUEABYIAC0WIQRORt0E5Sb/c/mZMgkXxQAtim5VSwUCX6C7lA8cbWRmQGtlcm5l
bC5vcmcACgkQF8UALYpuVUtWDwEA72foEH3GT2ub6HFuZ536/0nhw/91G5MX/yit
pZSFKgIA/164mk95ENjossdylxyUxW05cgjjU9N5vnNo7zR1kIME
=g7EU
-----END PGP SIGNATURE-----