boards: thingy53: define composite fuel gauge

Add a composite fuel-gauge device to the Thingy53 to enable converting
the raw voltage to a battery percentage.

(cherry picked from commit 6ad8ca9)

Original-Signed-off-by: Jordan Yates <jordan@embeint.com>
GitOrigin-RevId: 6ad8ca9
Cr-Build-Id: 8738238973287044049
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8738238973287044049
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I9ddc26346d85edd431f7f9fc8b8ff924e254e233
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5827658
Tested-by: Ting Shen <phoenixshen@chromium.org>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>

boards/nordic/thingy53/thingy53_nrf5340_common.dtsi

@@ -5,6 +5,7 @@
  */
 #include "thingy53_nrf5340_common-pinctrl.dtsi"
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/battery/battery.h>
 
 / {
 	chosen {
@@ -97,6 +98,14 @@
 		power-gpios = <&gpio0 16 0>;
 	};
 
+	fuel_gauge: fuel_gauge {
+		compatible = "zephyr,fuel-gauge-composite";
+		battery-voltage = <&vbatt>;
+		device-chemistry = "lithium-ion-polymer";
+		ocv-capacity-table-0 = <BATTERY_OCV_CURVE_LITHIUM_ION_POLYMER_DEFAULT>;
+		charge-full-design-microamp-hours = <1350000>;
+	};
+
 	regulator_3v3: regulator-3v3-ctrl {
 		compatible = "regulator-fixed";
 		regulator-name = "ncp114";