dt-bindings: interrupt-controller: al-fic: remove redundant binding

Remove dt binding description for standard binding.
Signed-off-by: Talel Shenhar <talel@amazon.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/amazon,al-fic.txt

@@ -5,21 +5,19 @@ Required properties:
 - compatible: should be "amazon,al-fic"
 - reg: physical base address and size of the registers
 - interrupt-controller: identifies the node as an interrupt controller
-- #interrupt-cells: must be 2.
-  First cell defines the index of the interrupt within the controller.
-  Second cell is used to specify the trigger type and must be one of the
-  following:
-    - bits[3:0] trigger type and level flags
-	1 = low-to-high edge triggered
-	4 = active high level-sensitive
-- interrupt-parent: specifies the parent interrupt controller.
+- #interrupt-cells : must be 2. Specifies the number of cells needed to encode
+  an interrupt source. Supported trigger types are low-to-high edge
+  triggered and active high level-sensitive.
 - interrupts: describes which input line in the interrupt parent, this
   fic's output is connected to. This field property depends on the parent's
   binding
 
+Please refer to interrupts.txt in this directory for details of the common
+Interrupt Controllers bindings used by client devices.
+
 Example:
 
-amazon_fic: interrupt-controller@0xfd8a8500 {
+amazon_fic: interrupt-controller@fd8a8500 {
 	compatible = "amazon,al-fic";
 	interrupt-controller;
 	#interrupt-cells = <2>;