MIPS: Alchemy: Convert to new irq chip functions

Fix the deadlock in set_type() while at it:

The code called set_irq_chip_and_handler_name() resp. set_irq_chip()
from the set_type() callback. That only works on UP and lock debugging
disabled. Otherwise it would dead lock on desc->lock.

__irq_set_chip_handler_name_locked() avoids that.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2173/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>