[nrf fromlist] shell: backends: uart: implement pm_device_runtime#3491

bjarki-andreasen merged 1 commit intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

bjarki-andreasen:shell-backend-uart-pm-runtimebjarki-andreasen/sdk-zephyr:shell-backend-uart-pm-runtimeCopy head branch name to clipboard