[kernel]: update sonic linux kernel submodule

* 90c4cdb 2018-09-22 | Fix a mlnx hardware-management issue (sonic-net#61) Signed-off-by: Kevin Wang <kevinw@mellanox.com>
kevinwangsk · Sep 26, 2018 · ceae01c · ceae01c
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commit ceae01c
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diff --git a/src/sonic-linux-kernel b/src/sonic-linux-kernel