ath79: ignore the abused interrupt-map on PCIe node

ath79: ignore the abused interrupt-map on PCIe node

ath79 PCIe interrupt controller has stopped working correctly. This
is because the DT exposing a non-sensical interrupt-map property,
and their drivers relying on the kernel ignoring this property[1].

This patch fixes the PCIe init error:
ath9k 0000:00:00.0: of_irq_parse_pci: failed with rc=-14

Notice:
This is just a workaround, not a fix. PCIe driver and related dts
node need to be rewritten.

[1] https://lore.kernel.org/all/20211201114102.13446-1-maz@kernel.org/

Signed-off-by: Shiji Yang <yangshiji66@qq.com>