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

arch/arm64/boot/dts/qcom/msm8998-xiaomi-sagit.dts

@@ -213,7 +213,6 @@ rmi4-f12@12 {
 
 		rmi4-f1a@1a {
 			reg = <0x1a>;
-			syna,codes = <KEY_BACK KEY_APPSELECT>;
 		};
 	};
 };