ASoC: samsung: Constify snd_soc_dapm_{route,widget} structs

These structs only have their address assigned to the
dapm_{routes,widget} fields in the snd_soc_card struct,
both which are pointers to const data. Make them const to
allow the compiler to put them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220330204227.25081-1-rikard.falkeborn@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>