drm/bridge/synopsys: dw-hdmi: Add an option to suppress loading CEC driver

This adds DW-HDMI driver a glue option to disable loading of the CEC sub-driver.

On some SoCs, the CEC functionality is enabled in the IP config bits, but the
CEC bus is non-functional like on Amlogic SoCs, where the CEC config bit is set
but the DW-HDMI CEC signal is not connected to a physical pin, leading to some
confusion when the DW-HDMI CEC controller can't communicate on the bus.

Reviewed-by: Neil Armstrong <[email protected]>
Signed-off-by: Jernej Skrabec <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Acked-by: Hans Verkuil <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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