ARM: dts: omap5-uevm: mark TWL6037 as system-power-controller

This allows the palmas pm_power_off to kick in on power off command
and switch off the board.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>

arch/arm/boot/dts/omap5-uevm.dts

@@ -249,6 +249,7 @@
 		reg = <0x48>;
 		interrupt-controller;
 		#interrupt-cells = <2>;
+		ti,system-power-controller;
 
 		extcon_usb3: palmas_usb {
 			compatible = "ti,palmas-usb-vid";