Warn if IRQ overlaps with fixed tile assignments

[ripatel-fd]

Any tile with a fixed CPU assignment will use 100% time share of that CPU.

This can cause issues if a IRQ/soft-IRQ is scheduled on the same core. irqbalance seems to be not very smart and occasionally reassigns net channels on Firedancer-reserved CPUs even if there are lots of other CPUs free.

We should start by printing a warning to the user if the smp_affinity mask is set incorrectly.