[nrf noup] Support intermediary SLM optimized modem UART backend#3021

rlubos merged 1 commit intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

bjarki-andreasen:modem-backend-uart-slmbjarki-andreasen/sdk-zephyr:modem-backend-uart-slmCopy head branch name to clipboard