arm64: dts: qcom: pmi8998: add flash LED controller

Qualcomm PMIC PMI8998 has a 3 channel flash LED driver which is used
by many phones for 1 or 2 flash LEDs. Each LED can be used in flash mode
or torch mode. Add the flash LED controller node to PMI8998 DTS.
Signed-off-by: Dylan Van Assche <me@dylanvanassche.be>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230518133113.273880-3-me@dylanvanassche.be

arch/arm64/boot/dts/qcom/pmi8998.dtsi

@@ -60,6 +60,12 @@ pmi8998_lpg: pwm {
 			status = "disabled";
 		};
 
+		pmi8998_flash: led-controller@d300 {
+			compatible = "qcom,pmi8998-flash-led", "qcom,spmi-flash-led";
+			reg = <0xd300>;
+			status = "disabled";
+		};
+
 		pmi8998_wled: leds@d800 {
 			compatible = "qcom,pmi8998-wled";
 			reg = <0xd800>, <0xd900>;