This reverts commit 518de763a6.
This commit switched nrf5340 devices to use the icbmsg
IPC backend.
Unfortunately this backend is not currently supported
in the nrf5340bsim target (it is not properly configured)
which results in a segfault during its initialization.
As this issue is currently blocking CI for all BT development
in Zephyr, let's revert this provisionally while we add
support for it.
See
https://github.com/zephyrproject-rtos/zephyr/issues/78099
for more info.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>