tests/subsys/logging/log_core/ and tests/subsys/shell/shell/ hang on qemu_cortex_a53 and qemu_riscv64

[dcpleung]

Describe the bug
When running tests/subsys/logging/log_core/ and tests/subsys/shell/shell/ on qemu_cortex_a53 and qemu_riscv64, they both hang resulting in twister failure. Git bisect points to commit 174cb7f (adding 64-bit atomic) where the issue starts to appear.

To Reproduce
west build -d /tmp/build -p -b qemu_cortex_a53 tests/subsys/shell/shell/ -t run or
west build -d /tmp/build -p -b qemu_cortex_a53 tests/subsys/logging/log_core/ -t run or
west build -d /tmp/build -p -b qemu_riscv64 tests/subsys/shell/shell/ -t run or
west build -d /tmp/build -p -b qemu_riscv64 tests/subsys/logging/log_core/ -t run

Expected behavior
Tests finish successfully.

Impact
Annoyance. But probably will affect CI which means all PR would be marked with build failure.

Environment (please complete the following information):

• OS: Linux
• Toolchain: Zephyr SDK 0.13.1
• On commit a5c2a61