dt-bindings: power: reset: qcom: Add qcom,pm8998-pon compatibility line

Update bindings to support for qcom,pm8998-pon which uses gen2 pon

Cc: Andy Gross <agross@kernel.org>
Cc: David Brown <david.brown@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: devicetree@vger.kernel.org
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/reset/qcom,pon.txt

@@ -9,6 +9,7 @@ Required Properties:
 -compatible: Must be one of:
 	"qcom,pm8916-pon"
 	"qcom,pms405-pon"
+	"qcom,pm8998-pon"
 
 -reg: Specifies the physical address of the pon register