genirq: Drop redundant irq_init_effective_affinity

It does exactly the same thing as irq_data_update_effective_affinity.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220701200056.46555-5-samuel@sholland.org