arm64: dts: qcom: msm8916-samsung-gt510: Add capacitive keys

gt510 has two capacitive keys on the bottom. Define keycodes to enable
them.
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Link: https://lore.kernel.org/r/20230725-gt5-panel-v1-3-7c787e33a614@trvn.ruSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/msm8916-samsung-gt510.dts

@@ -107,6 +107,8 @@ touchscreen@4a {
 
 		pinctrl-0 = <&tsp_int_rst_default>;
 		pinctrl-names = "default";
+
+		linux,keycodes = <KEY_APPSELECT KEY_BACK>;
 	};
 };