dt-bindings: clock: qcom: rpmcc: Document MSM8226 compatible

Add the dt-binding for the RPM Clock Controller on the MSM8226 SoC.
Signed-off-by: Bartosz Dudziak <bartosz.dudziak@snejp.pl>
Link: https://lore.kernel.org/r/20210502122027.9351-4-bartosz.dudziak@snejp.plAcked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/qcom,rpmcc.txt

@@ -12,6 +12,7 @@ Required properties :
 
 			"qcom,rpmcc-msm8660", "qcom,rpmcc"
 			"qcom,rpmcc-apq8060", "qcom,rpmcc"
+			"qcom,rpmcc-msm8226", "qcom,rpmcc"
 			"qcom,rpmcc-msm8916", "qcom,rpmcc"
 			"qcom,rpmcc-msm8936", "qcom,rpmcc"
 			"qcom,rpmcc-msm8974", "qcom,rpmcc"