ARM: dts: am335x-sl50: enable tsadc on SL50 board

The tsadc is used to read various voltages on the board, so enable it
to be able to read these voltages from userspace.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-sl50.dts

@@ -732,3 +732,11 @@ &ehrpwm1 {
 &lcdc {
 	status = "okay";
 };
+
+&tscadc {
+	status = "okay";
+};
+
+&am335x_adc {
+	ti,adc-channels = <0 1 2 3 4 5 6 7>;
+};