arm64: dts: qcom: cp01-c1: remove bootargs-append

bootargs-append is a leftover from the vendor SDK, and does not exist
in the mainline kernel at all, so remove it.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220927201415.1265191-1-robimarko@gmail.com