ARM: tegra: Enable cros-ec-spi as wake source

The cros_ec driver currently assumes that cros-ec-spi compatible device
nodes are a wakeup-source even though the wakeup-source property is not
defined.

Some Chromebooks use a separate wake pin, while others overload the
interrupt for wake and IO. With the current assumption, spurious wakes
can occur on systems that use a separate wake pin. It is planned to
update the driver to no longer assume that the EC interrupt pin should
be enabled for wake.

Add the wakeup-source property to all cros-ec-spi compatible device
nodes to signify to the driver that they should still be a valid wakeup
source.

Signed-off-by: Mark Hasemeyer <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

arch/arm/boot/dts/nvidia/tegra124-nyan.dtsi

···
 			interrupt-parent = <&gpio>;
 			interrupts = <TEGRA_GPIO(C, 7) IRQ_TYPE_LEVEL_LOW>;
 			reg = <0>;
+			wakeup-source;
 
 			google,cros-ec-spi-msg-delay = <2000>;
 

arch/arm/boot/dts/nvidia/tegra124-venice2.dts

···
 			interrupt-parent = <&gpio>;
 			interrupts = <TEGRA_GPIO(C, 7) IRQ_TYPE_LEVEL_LOW>;
 			reg = <0>;
+			wakeup-source;
 
 			google,cros-ec-spi-msg-delay = <2000>;