samples: Align to nrf5340 icbmsg backend

[dchat-nordic]

Align the overlays to nrf5340 icbmsg backend.

CI parameters

Github_actions:
  #(branch, hash, pull/XXX/head)
  NRF_revision: pull/17741/head

  # Do not change after creating PR
  Create_NRF_PR: false
Jenkins:
  test-sdk-sidewalk: master

Description

JIRA ticket: NCSDK-27191

Self review

• There is no commented code.
• There are no TODO/FIXME comments without associated issue ticket.
• Commits are properly organized.
• Change has been tested.
• Tests were updated (if applicable).

[github-actions]

Sample		diff	used	total
nrf54l15dk/nrf54l15/cpuapp:sample.sidewalk.dut.no_secure	RAM	0 B	139.64 KB	0 B
	ROM	4 B	483.61 KB	0 B
nrf54l15dk/nrf54l15/cpuapp:sample.sidewalk.hello	RAM	0 B	117.13 KB	0 B
	ROM	32 B	440.98 KB	0 B
nrf54l15dk/nrf54l15/cpuapp:sample.sidewalk.hello.ble_only	RAM	0 B	90.41 KB	0 B
	ROM	32 B	344.68 KB	0 B
thingy53/nrf5340/cpuapp:sample.sidewalk.demo.ble_only	RAM	397 B	106.1 KB	0 B
	ROM	-2.25 KB	333.84 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.demo	RAM	0 B	117.68 KB	0 B
	ROM	48 B	431.15 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.demo.ble_only	RAM	0 B	102.35 KB	0 B
	ROM	48 B	352.97 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.dut	RAM	0 B	141.27 KB	0 B
	ROM	16 B	495.03 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.dut.no_secure	RAM	0 B	141.25 KB	0 B
	ROM	16 B	486.49 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.hello	RAM	0 B	118.85 KB	0 B
	ROM	48 B	445.96 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.hello.ble_only	RAM	0 B	92.17 KB	0 B
	ROM	48 B	351.22 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.hello.ble_only.release	RAM	0 B	87.36 KB	0 B
	ROM	-12 B	287.54 KB	0 B
nrf52840dk/nrf52840:sample.sidewalk.hello.release	RAM	0 B	102.7 KB	0 B
	ROM	-12 B	362.36 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.demo	RAM	397 B	111.55 KB	0 B
	ROM	-2.28 KB	373.66 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.demo.ble_only	RAM	397 B	96.36 KB	0 B
	ROM	-2.28 KB	294.36 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.dut	RAM	445 B	135.3 KB	0 B
	ROM	-2.23 KB	438.38 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.dut.no_secure	RAM	445 B	135.29 KB	0 B
	ROM	-2.23 KB	430.92 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.hello	RAM	397 B	112.99 KB	0 B
	ROM	-2.28 KB	388.75 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.hello.ble_only	RAM	397 B	86.45 KB	0 B
	ROM	-2.28 KB	292.85 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.hello.ble_only.release	RAM	397 B	81.79 KB	0 B
	ROM	-3.96 KB	225.39 KB	0 B
nrf5340dk/nrf5340/cpuapp:sample.sidewalk.hello.release	RAM	397 B	96.98 KB	0 B
	ROM	-3.94 KB	300.93 KB	0 B
nrf54l15dk/nrf54l15/cpuapp:sample.sidewalk.demo	RAM	0 B	115.74 KB	0 B
	ROM	32 B	426.38 KB	0 B
nrf54l15dk/nrf54l15/cpuapp:sample.sidewalk.demo.ble_only	RAM	0 B	100.37 KB	0 B
	ROM	32 B	346.45 KB	0 B