Also call stateChanged in BcmSwitch when state has changed
Also call stateChanged in BcmSwitch when state has changed

Summary: Without this we don't get LEDs after state changes (i.e. coldboot).

Differential Revision: D4975445

fbshipit-source-id: 1a8eebea1d68bdbff35de147d797cee7e5b376c5

peterlei/fboss,peterlei/fboss,peterlei/fboss,peterlei/fboss