The property to disable bias is "bias-disable".

Fixes: e76c7e1f ("arm64: dts: qcom: sm8250-edo: Add Samsung touchscreen")
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220930192954.242546-3-krzysztof.kozlowski@linaro.org