of/documentation: Fix a typo in exynos5250-clock.txt

The clocks should be numbered sequentially as they are represented as
enum values in the clock driver.

Typo introduced by commit 17d4cacc ("clk: exynos5250: register
display block gate clocks to common clock framework")
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

Documentation/devicetree/bindings/clock/exynos5250-clock.txt

@@ -154,7 +154,7 @@ clock which they consume.
   dsim0			341
   dp			342
   mixer			343
-  hdmi			345
+  hdmi			344
 
 Example 1: An example of a clock controller node is listed below.