RAP-1130 Respect channel selection in idg-cal cpu phasor kernel
The channel selection for a subgrid was not respected by the idg-cal cpu kernel kernel_phasor.
This MR fixes that by adjusting the range of the for loop over channels.
The channel selection for a subgrid was not respected by the idg-cal cpu kernel kernel_phasor.
This MR fixes that by adjusting the range of the for loop over channels.