default or selected kernelversion does not have config value CONFIG_SSB_SILENT.
Result is shown for kernelversion 6.7-rc3

No SSB kernel messages

configname: CONFIG_SSB_SILENT

Linux Kernel Configuration
└─>Device Drivers
└─>Sonics Silicon Backplane
└─>No SSB kernel messages
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
This option turns off all Sonics Silicon Backplane printks.
Note that you won't be able to identify problems, once
messages are turned off.
This might only be desired for production kernels on
embedded devices to reduce the kernel size.

Say N

depends
CONFIG_EXPERT
CONFIG_SSB
CONFIG_SSB_POSSIBLE