ARM: tegra: add missing clock documentation to DT bindings

Many of the Tegra DT binding documents say nothing about the clocks or
clock-names properties, yet those are present and required in DT files.
This patch simply updates the documentation file to match the implicit
definition of the binding, based on real-world DT content.

All Tegra bindings that mention clocks are updated to have consistent
wording and formatting of the clock-related properties.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-By: Terje Bergstrom <tbergstrom@nvidia.com>

Documentation/devicetree/bindings/timer/nvidia,tegra20-timer.txt

@@ -8,6 +8,8 @@ Required properties:
 - compatible : should be "nvidia,tegra20-timer".
 - reg : Specifies base physical address and size of the registers.
 - interrupts : A list of 4 interrupts; one per timer channel.
+- clocks : Must contain one entry, for the module clock.
+  See ../clocks/clock-bindings.txt for details.
 
 Example:
 
@@ -18,4 +20,5 @@ timer {
 			0 1 0x04
 			0 41 0x04
 			0 42 0x04>;
+	clocks = <&tegra_car 132>;
 };

Documentation/devicetree/bindings/timer/nvidia,tegra30-timer.txt

@@ -10,6 +10,8 @@ Required properties:
 - reg : Specifies base physical address and size of the registers.
 - interrupts : A list of 6 interrupts; one per each of timer channels 1
     through 5, and one for the shared interrupt for the remaining channels.
+- clocks : Must contain one entry, for the module clock.
+  See ../clocks/clock-bindings.txt for details.
 
 timer {
 	compatible = "nvidia,tegra30-timer", "nvidia,tegra20-timer";
@@ -20,4 +22,5 @@ timer {
 		      0 42 0x04
 		      0 121 0x04
 		      0 122 0x04>;
+	clocks = <&tegra_car 214>;
 };