PCI: aardvark: Don't mask irq when mapping

By default, all Legacy INTx interrupts are masked, so there is no need to
mask this interrupt during irq_map() callback.

Link: https://lore.kernel.org/r/20220110015018.26359-21-kabel@kernel.org


Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>