CEC blocks idle on omap4

[Tony Lindgren]

Hi Hans,

Looks like CONFIG_OMAP4_DSS_HDMI_CEC=y blocks SoC core retention
idle on omap4 if selected.

Should we maybe move hdmi4_cec_init() to hdmi_display_enable()
and hdmi4_cec_uninit() to hdmi_display_disable()?

Or add some enable/disable calls in addtion to the init and
uninit calls that can be called from hdmi_display_enable()
and hdmi_display_disable()?

Cheers,

Tony