msm: dts: Add PFM port for Krait buck low power mode

Add PMIC PFM (Pulse Frequency Modulation) port to allow PMIC Krait
buck to be put in low power mode.

Change-Id: I2045d0aa4e3333951f4a814cf325cc8c7b527df1
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8974_pm.dtsi b/arch/arm/boot/dts/msm8974_pm.dtsi
index b2f3fec..c6cbca3 100644
--- a/arch/arm/boot/dts/msm8974_pm.dtsi
+++ b/arch/arm/boot/dts/msm8974_pm.dtsi
@@ -124,6 +124,7 @@
 		qcom,vctl-timeout-us = <50>;
 		qcom,vctl-port = <0x0>;
 		qcom,phase-port = <0x1>;
+		qcom,pfm-port = <0x2>;
 		qcom,saw2-spm-cmd-ret = [00 20 03 22 00 0f];
 		qcom,saw2-spm-cmd-gdhs = [00 20 32 42 07 44 22 50 02 32 50 0f];
 		qcom,saw2-spm-cmd-pc = [00 10 32 b0 11 42 07 01 b0 12 44