net.icmpv6 test fails on atsame54_xpro

[stephanosio]

Describe the bug
The tests/net/icmpv6/net.icmpv6 test fails on the atsame54_xpro board.

To Reproduce
Build and run tests/net/icmpv6/net.icmpv6 on atsame54_xpro.

Expected behavior
Test passes

Screenshots or console output

I: MAC: 02:04:25:00:28:ce
E: Failed to reserve data net buffers
E: Unable to initialize ETH queue0
E: ***** MPU FAULT *****
E:   Data Access Violation
E:   MMFAR Address: 0x0
E: r0/a1:  0x00000000  r1/a2:  0x00000000  r2/a3:  0x200012ec
E: r3/a4:  0x00000000 r12/ip:  0x2000094c r14/lr:  0x00008165
E:  xpsr:  0x61000000
E: Faulting instruction address (r15/pc): 0x000089ce
E: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
E: Current thread: 0x20000d8c (tx_workq)
E: Halting system

Environment (please complete the following information):

• OS: Ubuntu 18.04
• Toolchain: Zephyr SDK 0.11.2
• Commit SHA: ed2d263

[stephanosio]

@jukkar I see that this test runs fine with the on-chip Ethernet peripheral disabled (by setting CONFIG_ETH_SAM_GMAC=n in this particular case) as done in other net tests (e.g. #25226 (comment)).

I am wondering if Ethernet peripherals were ever meant to be enabled for these tests. On SAM E70, the test runs without disabling the Ethernet peripheral, but it prints out some disturbing errors:

E: Failed to reserve data net buffers
E: Unable to initialize ETH queue0

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