sfc/siena: Reinstate SRIOV init/fini function calls

They were removed in the first series since they were not used for EF10.
Put that code back for Siena, with the prototypes in siena_sriov.h
since that file is a more applicable place for it.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

siena: Make SRIOV support specific for Siena

Add a Siena Kconfig option and use it in stead of the sfc one.

Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

sfc: Move Siena specific files

Files are only moved, no changes are made.

Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>