arm64: dts: qcom: msm8996-sagit: drop unsupported syna,codes

Synaptics RMI4 Touchscreen bindings never defined syna,codes property
for function 1a.  No usage in Linux drivers.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230720115335.137354-3-krzysztof.kozlowski@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>