applications: nrf_desktop: align DFU doc after IronSide SE migration

[kapi-no]

Updated the nRF Desktop documentation page related to the bootloaders and DFU to align it with the recent migration of the nRF54H20 SoC to the IronSide SE architecture.

Ref: NCSDK-35488

[NordicBuilder]

CI Information

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Build number: 1

Inputs:

Sources:

sdk-nrf: PR head: a43b32715ea35ca488a38ef578499c09ba20ee63

more details

sdk-nrf:

PR head: a43b32715ea35ca488a38ef578499c09ba20ee63
merge base: cc348c5e87b4d87def7a8b28f24f12b47160cd96
target head (main): 9e14b6e4b8036bb723223fb91d1454811bfc1ef4
Diff

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	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

List of changed files detected by CI (1)

applications
│  ├── nrf_desktop
│  │  │ bootloader_dfu.rst

Outputs:

Toolchain

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Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

• ◻️ Toolchain
• ◻️ Build twister
• ◻️ Integration tests

Disabled integration tests

• • test-fw-nrfconnect-nrf_lrcs_positioning
  • desktop52_verification
  • test_ble_nrf_config
  • test-fw-nrfconnect-apps
  • test-fw-nrfconnect-ble_mesh
  • test-fw-nrfconnect-ble_samples
  • test-fw-nrfconnect-chip
  • test-fw-nrfconnect-fem
  • test-fw-nrfconnect-nfc
  • test-fw-nrfconnect-nrf-iot_libmodem-nrf
  • test-fw-nrfconnect-nrf-iot_lwm2m
  • test-fw-nrfconnect-nrf-iot_samples
  • test-fw-nrfconnect-nrf-iot_thingy91
  • test-fw-nrfconnect-nrf-iot_zephyr_lwm2m
  • test-fw-nrfconnect-nrf_crypto
  • test-fw-nrfconnect-ps-main
  • test-fw-nrfconnect-rpc
  • test-fw-nrfconnect-rs
  • test-fw-nrfconnect-tfm
  • test-fw-nrfconnect-thread-main
  • test-low-level
  • test-sdk-audio
  • test-sdk-dfu
  • test-sdk-find-my
  • test-sdk-mcuboot
  • test-sdk-wifi
  • test-secdom-samples-public

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[github-actions]

You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-25464/nrf/applications/nrf_desktop/bootloader_dfu.html

[MarekPieta]

Consider combining the note with the bullet point above (to keep the information together)

[MarekPieta]

I would also mention that for nRF54H every MCUboot slot contains combined application and radio core images (+ padding between them). Would be good to highlight it as it's the first platform that operates in this way (nRF53 handled this differently)