intel_adsp_cavs25 and intel_adsp_ace15/20: message_bus.zbus.user_data.channel_user_data fail

[KamilxPaszkiet]

Describe the bug
Test message_bus.zbus.user_data.channel_user_data failed on:

• cavs25
• intel_adsp/ace15_mtpm
• intel_adsp/ace20_lnl

To Reproduce

west twister -p intel_adsp/cavs25 -s tests/subsys/zbus/user_data/message_bus.zbus.user_data.channel_user_data

Expected behavior
Test should pass

Logs and console output

INFO:cavs-client:Start to monitor log output...
--
***** delaying boot 500ms (per build configuration) *****
*** Booting Zephyr OS build v3.7.0-4943-gab674e729786 (delayed boot 500ms) ***
Running TESTSUITE user_data
===================================================================
START - test_channel_user_data
 PASS - test_channel_user_data in 0.001 seconds
===================================================================
START - test_user_data_regression
D: Notifing 's observers. Starting VDED:
D:  0 -> 
D:  1 -> 

    Assertion failed at WEST_TOPDIR/os.rtos.zephyr.zephyr/tests/subsys/zbus/user_data/src/main.c:106: user_data_test_user_data_regression: *count not equal to 2

 FAIL - test_user_data_regression in 1.001 seconds
===================================================================
TESTSUITE user_data failed.

------ TESTSUITE SUMMARY START ------

SUITE FAIL -  50.00% [user_data]: pass = 1, fail = 1, skip = 0, total = 2 duration = 1.002 seconds
 - PASS - [user_data.test_channel_user_data] duration = 0.001 seconds
 - FAIL - [user_data.test_user_data_regression] duration = 1.001 seconds

------ TESTSUITE SUMMARY END ------

===================================================================

Environment (please complete the following information):

• OS: Linux
• Toolchain Zephyr SDK 0.16.8
• Version : v3.7.0-4943