lib: at_host: Write AT responses to correct UART device

[fellerts]

I hit a snag when trying to use uart3 for the AT host while CONFIG_LOG_BACKEND_UART was enabled. AT responses all ended up in the log, not on the chosen AT host UART device. This PR fixes my problem at least, but I have no idea if it breaks someone else's workflow. Figured I'd open at PR anyway.

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[NordicBuilder]

CI Information

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Build number: 1

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sdk-nrf: PR head: ef4eef186725693426a55c78c3e42189bb688015

more details

sdk-nrf:

PR head: ef4eef186725693426a55c78c3e42189bb688015
merge base: e24e07c4abc14f75b2f4e64e57ce2e083b0dc285
target head (main): e24e07c4abc14f75b2f4e64e57ce2e083b0dc285
Diff

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	ci-force-downstream	Force execution of downstream even if twister fails
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List of changed files detected by CI (1)

lib
│  ├── at_host
│  │  │ at_host.c

Outputs:

Toolchain

Version: 342151af73
Build docker image: docker-dtr.nordicsemi.no/sw-production/ncs-build:342151af73_bbe5b33786

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

• ◻️ Toolchain - Skipped: existing toolchain is used
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  • sdk-nrf test count: 324
• ❌ Integration tests
  • ❌ test-fw-nrfconnect-nrf-iot_samples
  • ⚠️ test-fw-nrfconnect-nrf-iot_cloud

Disabled integration tests

• • desktop52_verification
  • doc-internal
  • test_ble_nrf_config
  • test-fw-nrfconnect-apps
  • test-fw-nrfconnect-ble_mesh
  • test-fw-nrfconnect-ble_samples
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  • test-fw-nrfconnect-nrf-iot_serial_lte_modem
  • test-fw-nrfconnect-nrf-iot_thingy91
  • test-fw-nrfconnect-nrf-iot_zephyr_lwm2m
  • test-fw-nrfconnect-nrf_crypto
  • test-fw-nrfconnect-ps
  • test-fw-nrfconnect-rpc
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  • test-low-level
  • test-sdk-audio
  • test-sdk-dfu
  • test-sdk-find-my
  • test-sdk-mcuboot
  • test-sdk-pmic-samples
  • test-sdk-sidewalk
  • test-sdk-wifi
  • test-secdom-samples-public

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[fellerts]

I'll fix the compliance checks

[NordicBuilder]

You can find the documentation preview for this PR at this link.

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