[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (#16431)

#### Why I did it
src/sonic-linux-kernel
```
* 9cb7ea0 - (HEAD -> 202305, origin/202305) arm64: dts: marvell: Add Nokia 7215-IXS-A1 board (#321) (24 hours ago) [Pavan-Nokia]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-09-04 16:33:09 +08:00 committed by GitHub
parent 8b7e74b7e2
commit fec89be477
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23

@ -1 +1 @@
Subproject commit bf1ee0eb818d8ca17fffc7f35357a42aead44d6f
Subproject commit 9cb7ea028352ba6df78bcf1a56017b46586e9b42