For qemu_x86 and qemu_x86_64, it would seem that
heap-allocated thread stacks, as well as thread stacks
defined via K_THREAD_STACK_ARRAY_DEFINE(), must be at least
4096 bytes in size.
Using those sizes will ensure that these tests do not
fail with stack overflows or MMU faults.
Signed-off-by: Christopher Friedt <cfriedt@meta.com>
