ARM: dts: msm: Add cooling device property to charger in PMI8998

Add cooling-cells property to PMI8998 charger. This enables the charger
cooling device to be referenced in a thermal zone definition.

Change-Id: I8128a131ab0e56658bb261ac457378713108a3b2
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
diff --git a/arch/arm64/boot/dts/qcom/pmi8998.dtsi b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
index b53f7ac..886e792 100644
--- a/arch/arm64/boot/dts/qcom/pmi8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
@@ -76,6 +76,7 @@
 			compatible = "qcom,qpnp-smb2";
 			#address-cells = <1>;
 			#size-cells = <1>;
+			#cooling-cells = <2>;
 
 			qcom,pmic-revid = <&pmi8998_revid>;