Merge branch 'for-5.9/firmware-activate' into libnvdimm-for-next

This branch adds support for runtime firmware activation for NVDIMMs
that support it:

https://lore.kernel.org/linux-nvdimm/20200721104442.GF1676612@kroah.com/T/#m253296a85b1cd4ab8ad00efba4c3df2436437bf4