dt-bindings: ti-serdes-mux: Deprecate header with constants

The constants to define the idle state of SERDES MUX were defined in
bindings header. They are used only in DTS and driver uses the dt pro

dt-bindings: ti-serdes-mux: Deprecate header with constants

The constants to define the idle state of SERDES MUX were defined in
bindings header. They are used only in DTS and driver uses the dt property
to set the idle state making it unsuitable for bindings.
The constants are moved to header next to DTS ("arch/arm64/boot/dts/ti/")
and all the references to bindings header are removed.
So add a warning to mark this bindings header as deprecated.

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/20230721125732.122421-3-j-choudhary@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

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