Handle properly CEC clock on FB evenet and cable disconnection
    Thanks to mk01 for this patch

(cherry picked from commit 5403341d8e35384a4efb4c5a6a00d023c6b668b6)
Merge latest fixes for CEC driver as alluded here
https://github.com/xbmc-imx6/xbmc/issues/54#issuecomment-41498389