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

…tomatically (sonic-net#19548)

#### Why I did it
src/sonic-linux-kernel
```
* 88c1826 - (HEAD -> master, origin/master, origin/HEAD) [Micas] Kernel configuration is enabled to support mdio-gpio and spi-gpio (sonic-net#411) (27 hours ago) [Philo]
```
#### How I did it
#### How to verify it
#### Description for the changelog