Set engineer units as macros for channels
Issue: https://jira.esss.lu.se/browse/ICSHWI-7957
Set EGU-s as specified in the table (https://confluence.esss.lu.se/display/IS/LLRF+Channel+units).
Connected MR: epics-modules/rf/sis8300llrf!54 (merged)
Edited by Mateusz Nabywaniec