dt-bindings: iio: Add cros ec proximity yaml doc

Some cros ECs support a front proximity MKBP event via
'EC_MKBP_FRONT_PROXIMITY'. Add a DT binding to document this feature via
a node that is a child of the main cros_ec device node. Devices that
have this ability will describe this in firmware.

Cc: Dmitry Torokhov <[email protected]>
Cc: Benson Leung <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Gwendal Grignou <[email protected]>
Cc: <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Cc: Enric Balletbo i Serra <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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