dt-bindings: display: bridge: icn6211: Add support for external REFCLK

The ICN6211 is capable of deriving its internal PLL clock from either
MIPI DSI HS clock, external REFCLK clock, or even internal oscillator.
Currently supported is only the first option. Document support for
external REFCLK clock input in addition to that.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Jagan Teki <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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