ARM: 7023/1: L2x0: Add interrupts property to OF binding

Following the discussion here:
http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-August/007301.html

The L2x0 L2 Cache Controllers support a combined interrupt line
which can be used for several events (e.g. read/write/parity errors on
tag/data RAM, event counter increment/overflow). Unfortunately the
OF binding added in c519ecf2 ("ARM: 7009/1: l2x0: Add OF based
initialization") does not represent the interrupt.

This patch adds an "interrupts" property to the L2x0 OF binding,
representing the combined interrupt line.

Signed-off-by: Mark Rutland <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Acked-by: Will Deacon <[e-mail]>
Cc: Grant Likely <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Olof Johansson <[e-mail]>
Cc: Barry Song <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

Documentation/devicetree/bindings/arm/l2cc.txt

···
 - arm,filter-ranges : <start length> Starting address and length of window to
   filter. Addresses in the filter window are directed to the M1 port. Other
   addresses will go to the M0 port.
+- interrupts : 1 combined interrupt.
 
 Example:
 
···
         arm,filter-latency = <0x80000000 0x8000000>;
         cache-unified;
         cache-level = <2>;
+	interrupts = <45>;
 };