dt-bindings: media: s5p-mfc: Remove s5p-mfc.txt binding

dt-bindings: media: s5p-mfc: Remove s5p-mfc.txt binding

s5p-mfc bindings to json-schema is already merged with
this commit 538af6e5856b ("dt-bindings: media: s5p-mfc:
convert bindings to json-schema"). Remove s5p-mfc.txt
file.

Fixes: 538af6e5856b ("dt-bindings: media: s5p-mfc: convert bindings to json-schema")
Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240808134432.50073-1-aakarsh.jain@samsung.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>