ARM: dts: msm: Enable tri-led node for Ravelin

Add compatible string to led DT node for Ravelin. This
was removed from the bulk DT porting for Ravelin on qcom-6.6
device-tree branch.

Also, the pwm driver probe fails when the "qcom,num-lpg-channels"
value is higher than the number of configured channels in the
dtsi for the pwm node. This is because the driver uses the
lpg_sdam_base for every channel during probe and fails if not
configured correctly in the dtsi. So, change the num-lpg-channels
to 3 since only 3 channels are configured and used.

Change-Id: I9dbe8a2bf97316fad69ff6a5f9db42a19b839901
Signed-off-by: Shilpa Suresh <quic_c_sbsure@quicinc.com>

qcom/pmi632.dtsi

@@ -199,7 +199,7 @@
 			reg = <0xb300>;
 			reg-names = "lpg-base";
 			#pwm-cells = <2>;
-			qcom,num-lpg-channels = <5>;
+			qcom,num-lpg-channels = <3>;
 			nvmem-names = "ppg_sdam";
 			nvmem = <&pmi632_sdam7>;
 			qcom,pbs-client = <&pmi632_pbs_client3>;
@@ -235,6 +235,7 @@
 		};
 
 		pmi632_rgb: qcom,leds@d000 {
+			compatible = "qcom,tri-led";
 			reg = <0xd000>;
 			red {
 				label = "red";