Failed test: net.udp.udp (tests/net/udp/)  on sam_e70_xplained

Running this test and many other networking tests on e70 fails always the same way with the message below:

```
***** MPU FAULT *****
Executing thread ID (thread): 0x20401cd0
Faulting instruction address: 0xaaaaaaaa
Instruction Access Violation
Fatal fault in essential thread! Spinning...

```