powerpc/fsl: Update fman dt binding with clock name and qbman link

The clock name "fmanclk" was given in the example, but not specified
in the binding itself.  Made clock-names mandatory as otherwise there's
not much point having it.

Added a reference to the fsl,qman and fsl,bman properties proposed
in http://patchwork.ozlabs.org/patch/407034/ and
http://patchwork.ozlabs.org/patch/407035/Signed-off-by: Scott Wood <scottwood@freescale.com>

Documentation/devicetree/bindings/powerpc/fsl/fman.txt

@@ -79,12 +79,12 @@ PROPERTIES
 - clocks
 		Usage: required
 		Value type: <prop-encoded-array>
-		Definition: phandle for fman clock.
+		Definition: phandle for the fman input clock.
 
 - clock-names
-		usage: optional
+		usage: required
 		Value type: <stringlist>
-		Definition: A standard property
+		Definition: "fmanclk" for the fman input clock.
 
 - interrupts
 		Usage: required
@@ -104,6 +104,11 @@ PROPERTIES
 		"Work Queue (WQ) Channel Assignments in the QMan" section
 		in DPAA Reference Manual.
 
+- fsl,qman
+- fsl,bman
+		Usage: required
+		Definition: See soc/fsl/qman.txt and soc/fsl/bman.txt
+
 =============================================================================
 FMan MURAM Node