ARM: add DT bindings for the ARM11MPCore CPU cluster

The ARM11MPCore has a Snoop Control Unit, but references to it
were missing from the DT specification. Define a compatible
string for this unit.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/arm/scu.txt

@@ -10,10 +10,13 @@ References:
   Revision r2p0
 - Cortex-A5: see DDI0434B Cortex-A5 MPCore Technical Reference Manual
   Revision r0p1
+- ARM11 MPCore: see DDI0360F ARM 11 MPCore Processor Technical Reference
+  Manial Revision r2p0
 
 - compatible : Should be:
 	"arm,cortex-a9-scu"
 	"arm,cortex-a5-scu"
+	"arm,arm11mp-scu"
 
 - reg : Specify the base address and the size of the SCU register window.