ARM: dts: qcom: apq8026-samsung-matissewifi: Configure touch keys

Add touch keys which are handled in touchscreen driver.
Use KEY_APPSELECT for the left button because other devices use that
even though downstream kernel uses KEY_RECENT.
Signed-off-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20231204094649.10094-1-matti.lehtimaki@gmail.com
[bjorn: Wrapped each cell in <>, as requested by Luca]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm/boot/dts/qcom/qcom-apq8026-samsung-matisse-wifi.dts

@@ -268,6 +268,13 @@ touchscreen@4a {
 		interrupt-parent = <&tlmm>;
 		interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
 
+		linux,keycodes = <KEY_RESERVED>,
+				 <KEY_RESERVED>,
+				 <KEY_RESERVED>,
+				 <KEY_RESERVED>,
+				 <KEY_APPSELECT>,
+				 <KEY_BACK>;
+
 		pinctrl-names = "default";
 		pinctrl-0 = <&tsp_int_rst_default_state>;