dt-bindings: mtd: ingenic: Add compatible strings for JZ4740 and JZ4725B

Add compatible strings to probe the jz4780-nand and jz4780-bch drivers
from devicetree on the JZ4725B and JZ4740 SoCs from Ingenic.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt

@@ -6,7 +6,10 @@ memory-controllers/ingenic,jz4780-nemc.txt), and thus NAND device nodes must
 be children of the NEMC node.
 
 Required NAND controller device properties:
-- compatible: Should be set to "ingenic,jz4780-nand".
+- compatible: Should be one of:
+  * ingenic,jz4740-nand
+  * ingenic,jz4725b-nand
+  * ingenic,jz4780-nand
 - reg: For each bank with a NAND chip attached, should specify a bank number,
   an offset of 0 and a size of 0x1000000 (i.e. the whole NEMC bank).
 
@@ -72,7 +75,10 @@ NAND devices. The following is a description of the device properties for a
 BCH controller.
 
 Required BCH properties:
-- compatible: Should be set to "ingenic,jz4780-bch".
+- compatible: Should be one of:
+  * ingenic,jz4740-ecc
+  * ingenic,jz4725b-bch
+  * ingenic,jz4780-bch
 - reg: Should specify the BCH controller registers location and length.
 - clocks: Clock for the BCH controller.