RCG producing incorrect IPC rate from x2ioplsc0

IPC rate given as 491520 in chans/ipc/X2.ipc file. Should be 65536.

assigned to @erik.vonreis

added to epic cds&13

changed milestone to %advligorts 5.0.0

491520 == 2^19 (the iop model rate) - 2^15

Fixed in !461 (merged)

closed