dt-bindings: rtc: s3c: Use defines instead of clock numbers

Make the examples in S3C RTC bindings more readable and bring them
closer to real DTS by using defines for clocks.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/rtc/s3c-rtc.yaml

@@ -75,11 +75,14 @@ allOf:
 
 examples:
   - |
+    #include <dt-bindings/clock/exynos5420.h>
+    #include <dt-bindings/clock/samsung,s2mps11.h>
+
     rtc@10070000 {
         compatible = "samsung,s3c6410-rtc";
         reg = <0x10070000 0x100>;
         interrupts = <0 44 4>, <0 45 4>;
-        clocks = <&clock 0>, // CLK_RTC
-                 <&s2mps11_osc 0>; // S2MPS11_CLK_AP
+        clocks = <&clock CLK_RTC>,
+                 <&s2mps11_osc S2MPS11_CLK_AP>;
         clock-names = "rtc", "rtc_src";
     };