How to disable booting log at ncs2.7.0 Serial LTE modem?

Hi

Built and flashed ncs2.7.0 SLM application at NRF9151 DK. It will log booting log messages and then "Ready" as below.

Before ncs2.7.0, I found SLM application only logged "Ready" to indicate power on.

I also tried Quick Start apps to program latest SLM to NRF9151DK. It also only logged "Ready" without redundant booting log.

So, how can I modify prj.conf file to remove these log messages? 

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