[submodule] Update submodule sonic-linux-kernel to the latest HEAD au…

…tomatically (sonic-net#20045)

#### Why I did it
src/sonic-linux-kernel
```
* b2f73b6 - (HEAD -> master, origin/master, origin/HEAD) include adm1275 config within kconfig for usage on cisco platform (sonic-net#432) (35 hours ago) [Gregory Boudreau]
```
#### How I did it
#### How to verify it
#### Description for the changelog