Stack size revert in `samples/philosophers` break some in-tree boards

[fkokosinski]

Describe the bug Found with Renode while working on Renodepedia.

Changes introduced in #54969 break the Dining Philosophers demo for the following in-tree platforms:

• actinius_icarus
• circuitdojo_feather_nrf9160
• nrf5340_audio_dk_nrf5340_cpuapp
• nrf5340dk_nrf5340_cpuapp

To Reproduce Build and flash (or upload the sample by other means) the sample: west build -p -b <board_name> samples/philosophers

Expected behavior Philosopher statuses should be printed out.

Impact The demo doesn't work properly.

Logs and console output The demo freezes after printing the demo description section; no output for philosophers with STACK_SIZE=1024:

Demo Description
----------------
An implementation of a solution to the Dining Philosophers
problem (a classic multi-thread synchronization problem).
This particular implementation demonstrates the usage of multiple
preemptible and cooperative threads of differing priorities, as
well as dynamic mutexes and thread sleeping.

Environment (please complete the following information):

• OS: Linux
• Toolchain: Zephyr SDK
• Commit SHA: 0de8c6bf29e53f0b51cfc598739fbf70826bac53

[carlocaione]

@SakuRautio-ext FYI

[SakuGlumoff-ext]

I think the commit should be reverted and we can investigate the issue further internally.