arm: dts: qcom: Add generic PMIC gpio/MPP compat strings

Add the generic compatible strings for the PMIC gpio and MPP
modules found on qcom based PMICs.

Cc: <devicetree@vger.kernel.org>
Cc: "Ivan T. Ivanov" <iivanov@mm-sol.com>
Cc: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>

arch/arm/boot/dts/qcom-apq8064.dtsi

@@ -410,7 +410,8 @@
 
 				pm8921_gpio: gpio@150 {
 
-					compatible = "qcom,pm8921-gpio";
+					compatible = "qcom,pm8921-gpio",
+						     "qcom,ssbi-gpio";
 					reg = <0x150>;
 					interrupts = <192 1>, <193 1>, <194 1>,
 						     <195 1>, <196 1>, <197 1>,
@@ -434,7 +435,8 @@
 				};
 
 				pm8921_mpps: mpps@50 {
-					compatible = "qcom,pm8921-mpp";
+					compatible = "qcom,pm8921-mpp",
+						     "qcom,ssbi-mpp";
 					reg = <0x50>;
 					gpio-controller;
 					#gpio-cells = <2>;