gpio: drop users of irq_set_chip_and_handler_name()

Switch all users of irq_set_chip_and_handler_name() to simply
use irq_set_chip_and_handler(), all just provide a boilerplate
name like "demux" or "mux" - a fact which is anyway obvious
from the hwirq number from the irqdomain now present in e.g.
/proc/interrupts.

Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-lynxpoint.c b/drivers/gpio/gpio-lynxpoint.c
index f1ca9d5..89867ed 100644
--- a/drivers/gpio/gpio-lynxpoint.c
+++ b/drivers/gpio/gpio-lynxpoint.c
@@ -331,8 +331,7 @@
 {
 	struct lp_gpio *lg = d->host_data;
 
-	irq_set_chip_and_handler_name(irq, &lp_irqchip, handle_simple_irq,
-				      "demux");
+	irq_set_chip_and_handler(irq, &lp_irqchip, handle_simple_irq);
 	irq_set_chip_data(irq, lg);
 	irq_set_irq_type(irq, IRQ_TYPE_NONE);