ARM: BCM5301X: add IRQ numbers for PCIe controller

The driver for the PCIe controller was just added, this adds the
missing definition of the IRQ numbers to device tree. The driver itself
will be automatically detected by bcma.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>