[submodule] Update submodule sonic-linux-kernel to the latest HEAD automatically (#15784)

#### Why I did it
src/sonic-linux-kernel
```
* 694b338 - (HEAD -> 202012, origin/202012) [202012] Add crypto/zstd.ko module via CONFIG_CRYPTO_ZSTD (#320) (4 weeks ago) [Samuel Angebault]
```
This commit is contained in:
mssonicbld 2023-08-11 14:51:55 +08:00 committed by GitHub
parent 43f6281311
commit 559fe85353
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23

@ -1 +1 @@
Subproject commit 815cb349544338a16d2f7740aee87db13bb8bc1a
Subproject commit 694b3381eff8e6ec098885e0125f9dc31aaa1010