dt-bindings: fsl: add LS1043A/LS1046A/LS2080A compatible for SCFG and DCFG

SCFG and DCFG are SoC-specific devices can be found on SoCs like LS1021A,
LS1043A and LS1046A, this patch updates bindings for SCFG and DCFG to
reflect more SoCs.
Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.txt

@@ -97,7 +97,7 @@ Freescale LS1021A Platform Device Tree Bindings
 Required root node compatible properties:
   - compatible = "fsl,ls1021a";
 
-Freescale LS1021A SoC-specific Device Tree Bindings
+Freescale SoC-specific Device Tree Bindings
 -------------------------------------------
 
 Freescale SCFG
@@ -105,7 +105,11 @@ Freescale SCFG
 configuration and status registers for the chip. Such as getting PEX port
 status.
   Required properties:
-  - compatible: should be "fsl,ls1021a-scfg"
+  - compatible: Should contain a chip-specific compatible string,
+	Chip-specific strings are of the form "fsl,<chip>-scfg",
+	The following <chip>s are known to be supported:
+	ls1021a, ls1043a, ls1046a, ls2080a.
+
   - reg: should contain base address and length of SCFG memory-mapped registers
 
 Example:
@@ -119,7 +123,11 @@ Freescale DCFG
 configuration and status for the device. Such as setting the secondary
 core start address and release the secondary core from holdoff and startup.
   Required properties:
-  - compatible: should be "fsl,ls1021a-dcfg"
+  - compatible: Should contain a chip-specific compatible string,
+	Chip-specific strings are of the form "fsl,<chip>-dcfg",
+	The following <chip>s are known to be supported:
+	ls1021a, ls1043a, ls1046a, ls2080a.
+
   - reg : should contain base address and length of DCFG memory-mapped registers
 
 Example: