arm64: dts: qcom: sdm845: 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.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Mark Hasemeyer <markhas@chromium.org>
Link: https://lore.kernel.org/r/20240102140734.v4.16.I870e2c3490e7fc27a8f6bc41dba23b3dfacd2d13@changeidSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi

@@ -852,6 +852,7 @@ cros_ec: ec@0 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&ec_ap_int_l>;
 		spi-max-frequency = <3000000>;
+		wakeup-source;
 
 		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";