Include Magnitue and Angle PV for PI Controller and calibration
PIMagAng Channel provides the control of PI Channels (SP and FF) using Mag/Ang. It is possible to calibrate it using waveform (EGU and RAW), and it updates automatically the I/Q values.
These changes are needed to implement the PI Controller calibration procedure (https://jira.esss.lu.se/browse/ICSHWI-4504).
This MR solves these tickets:
https://jira.esss.lu.se/browse/ICSHWI-4693 https://jira.esss.lu.se/browse/ICSHWI-4847