smp_svr samle dosen't build for any target

[nvlsianpu]

Describe the bug
Can't build smp_svr sample on nrf52 device

To Reproduce
Steps to reproduce the behavior:

1. west build -d build/smp_svr -b nrf52840dk_nrf52840 ./zephyr/samples/subsys/mgmt/mcumgr/smp_svr/
2. build land in the error:

/home/anpu/codedev/zephyrproject/modules/lib/mcumgr/cmd/os_mgmt/port/zephyr/src/zephyr_os_mgmt.c: In function 'os_mgmt_impl_reset':
/home/anpu/codedev/zephyrproject/modules/lib/mcumgr/cmd/os_mgmt/port/zephyr/src/zephyr_os_mgmt.c:94:66: error: incompatible type for argument 3 of 'k_timer_start'
   94 |     k_timer_start(&zephyr_os_mgmt_reset_timer, K_MSEC(delay_ms), 0);
      |                                                                  ^
      |                                                                  |
      |                                                                  int
In file included from /home/anpu/codedev/zephyrproject/zephyr/include/kernel.h:5570,
                 from /home/anpu/codedev/zephyrproject/zephyr/include/zephyr.h:18,
                 from /home/anpu/codedev/zephyrproject/modules/lib/mcumgr/cmd/os_mgmt/port/zephyr/src/zephyr_os_mgmt.c:20:
zephyr/include/generated/syscalls/kernel.h:389:92: note: expected 'k_timeout_t' {aka 'struct <anonymous>'} but argument is of type 'int'
  389 | static inline void k_timer_start(struct k_timer * timer, k_timeout_t duration, k_timeout_t period)
      |                                                                                ~~~~~~~~~~~~^~~~~~
[96/125] Building C object zephyr/kernel/CMakeFiles/kernel.dir/fatal.c.obj

Expected behavior
sample builds and works

Environment (please complete the following information):
zephyr after #20983 PR was merged
master at 762b521

[nvlsianpu]

FYI @aunsbjerg @jukkar

[nvlsianpu]

cc @de-nordic

[nvlsianpu]

CONFIG_LEGACY_TIMEOUT_API=y fixes the issue.
It should be selected unless #24341 not merged.
temporary solved here: https://github.com/zephyrproject-rtos/zephyr/pull/24126/files

[aunsbjerg]

@nvlsianpu Is there a case for building the SMP sample without any of the overlay configs? The base config does not enable any of the SMP transports, which renders the sample pretty useless as far as I can tell.

This works:
west build -d build/smp_svr -b nrf52840dk_nrf52840 ./zephyr/samples/subsys/mgmt/mcumgr/smp_svr/ -- -DOVERLAY_CONFIG=overlay-bt.conf

Running sanitycheck on the samples also works:
./zephyr/scripts/sanitycheck -T zephyr/samples/subsys/mgmt/mcumgr/smp_svr/ -c builds fine.