Input: Fully open-code compatible for grepping

It is very useful to find driver implementing compatibles with `git grep
compatible`, so driver should not use defines for that string, even if
this means string will be effectively duplicated.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250613071653.46809-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>