genirq/irqdesc: Drop excess kernel-doc entry @lookup

Fix kernel-doc warning in irqdesc.c:

../kernel/irq/irqdesc.c:692: warning: Excess function parameter 'lookup' description in 'handle_domain_irq'

Fixes: e1c05491 ("genirq: Move non-irqdomain handle_domain_irq() handling into ARM's handle_IRQ()")
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210628004044.9011-1-rdunlap@infradead.org

kernel/irq/irqdesc.c

@@ -682,7 +682,6 @@ EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
  *                     usually for a root interrupt controller
  * @domain:	The domain where to perform the lookup
  * @hwirq:	The HW irq number to convert to a logical one
- * @lookup:	Whether to perform the domain lookup or not
  * @regs:	Register file coming from the low-level handling code
  *
  * Returns:	0 on success, or -EINVAL if conversion has failed