Some embedded platforms have eeproms located in flash. Add nvmem support to handle this. Support is added for PCI and SOC backends. Signed-off-by: Rosen Penev <rosenp@gmail.com> Link: https://patch.msgid.link/20251027180639.3797-1-rosenp@gmail.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>