genirq/devres: Remove excess parameter from kernel doc

Building with 'make W=1' complains:

  CC      kernel/irq/devres.o
kernel/irq/devres.c:104: warning: Excess function parameter 'thread_fn'
			 description in 'devm_request_any_context_irq'

Remove it.
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/31207.1552378676@turing-police

kernel/irq/devres.c

@@ -84,8 +84,6 @@ EXPORT_SYMBOL(devm_request_threaded_irq);
  *	@dev: device to request interrupt for
  *	@irq: Interrupt line to allocate
  *	@handler: Function to be called when the IRQ occurs
- *	@thread_fn: function to be called in a threaded interrupt context. NULL
- *		    for devices which handle everything in @handler
  *	@irqflags: Interrupt type flags
  *	@devname: An ascii name for the claiming device, dev_name(dev) if NULL
  *	@dev_id: A cookie passed back to the handler function