Adding OpenWrt support for Xirrus XR-2400 Target

I'm stuck at

[    0.756898] CPU1 revision is: 000d0708 (Cavium Octeon+)
[    0.757069] smp: Brought up 1 node, 2 CPUs
[    0.770279] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.779889] futex hash table entries: 512 (order: 4, 65536 bytes)
[    0.786411] NET: Registered protocol family 16
[    0.800207] PCIe: Initializing port 0
[    0.830253] PCIe: Port 0 aligning TLP counters as workaround to maintain ordering