[submodule]: update sonic-linux-kernel (#6908)

1. [dni_dps460] Add attributes to retrieve PMBus status command codes sonic-net/sonic-linux-kernel@65fccd7
2. [mellanox]: Backport new kernel patches sonic-net/sonic-linux-kernel@2fcd4e3
3. [ci]: build amd64/armhf/arm64 for CI build sonic-net/sonic-linux-kernel@7c57fef
4. Fix read and write failure to ‘fan1_target’ attribute of ‘dni_dps460’ sonic-net/sonic-linux-kernel@fc74b1c
5. [backport]: i2c mux pca954x allow management of device idle state sonic-net/sonic-linux-kernel@173ebe7
6. README: Fix typo in *difficult* sonic-net/sonic-linux-kernel@7778c99