ztest: error_hook: Exclude cortex_r8_virtual from divide-by-zero tests

Cortex-R8 emulated in Renode doesn't trigger exceptions on divide by zero.
We only skip the virtual SoC, so the test will still apply on a physical
target.

Signed-off-by: Marek Slowinski <mslowinski@antmicro.com>
Signed-off-by: Mateusz Hołenko <mholenko@antmicro.com>