manifest: Update revision of sdk-nrfxlib

[NordicBuilder]

Automatically created by Github Action from PR: nrfconnect/sdk-nrfxlib#1278

[NordicBuilder]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
nrfxlib	nrfconnect/sdk-nrfxlib@1b6570a	nrfconnect/sdk-nrfxlib#1278	nrfconnect/sdk-nrfxlib#1278/files

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite
test-fw-nrfconnect-nrf-iot_cloud	X
test-fw-nrfconnect-nrf-iot_libmodem-nrf	X
test-fw-nrfconnect-nrf-iot_lwm2m	X
test-fw-nrfconnect-nrf-iot_mosh	X
test-fw-nrfconnect-nrf-iot_positioning	X
test-fw-nrfconnect-nrf-iot_samples	X
test-fw-nrfconnect-nrf-iot_zephyr_lwm2m	X

Detailed information of selected test modules

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[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

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