Remove TODO's

Created by: silabs-oivind

Removed TODO's suggesting not to propagate PC to EX and WB if there are no exceptions.

We can't do this because asynchronous events (e.g. interrupt or debug req) need valid PC's in all stages to store in mepc or dpc.

Signed-off-by: Oivind Ekelund oivind.ekelund@silabs.com