msm: msm_watchdog_v2: convert ipi-ping to boolean

The data type of the ipi-ping field should match its semantics: a
boolean value. Change the watchdog driver to use the boolean
procedures and change all device tree clients to use the boolean
syntax.

Change-Id: I36459ebc5dc25efe8939f477405fd34ea7b650d1
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8226.dtsi b/arch/arm/boot/dts/msm8226.dtsi
index 475ed40..96e491c 100644
--- a/arch/arm/boot/dts/msm8226.dtsi
+++ b/arch/arm/boot/dts/msm8226.dtsi
@@ -89,7 +89,7 @@
 		interrupts = <0 3 0>, <0 4 0>;
 		qcom,bark-time = <11000>;
 		qcom,pet-time = <10000>;
-		qcom,ipi-ping = <1>;
+		qcom,ipi-ping;
 	};
 
 	qcom,smem@fa00000 {