dt-bindings: qman: Remove pool channel node

No device tree has these, nor does any driver look for them.

Signed-off-by: Scott Wood <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/soc/fsl/qman-portals.txt

···
 CONTENTS
 
 	- QMan Portal
-	- QMan Pool Channel
 	- Example
 
 QMan Portal Node
···
 	Value type:	<phandle>
 	Definition:	The phandle to the particular hardware device that this
 			portal is connected to.
-
-DPAA QMan Pool Channel Nodes
-
-Pool Channels are defined with the following properties.
-
-PROPERTIES
-
-- compatible
-	Usage:		Required
-	Value type:	<stringlist>
-	Definition:	Must include "fsl,qman-pool-channel"
-			May include "fsl,<SoC>-qman-pool-channel"
-
-- fsl,qman-channel-id
-	Usage:		Required
-	Value type:	<u32>
-	Definition:	The hardware index of the channel. This can also be
-			determined by dividing any of the channel's 8 work queue
-			IDs by 8
 
 EXAMPLE