ARM: dts: fix Cygnus nand device node

The third compatible string "brcm,brcmnand" in bcm-cygnus.dtsi nand node
is incorrect, redundant and should be removed. "brcm,brcmnand" is meant to
be used by STB based Broadcom SoCs. All iProc based SoCs should use
"brcm,nand-iproc".
Signed-off-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm-cygnus.dtsi

@@ -234,8 +234,7 @@ uart3: serial@18023000 {
 		};
 
 		nand: nand@18046000 {
-			compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1",
-				     "brcm,brcmnand";
+			compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1";
 			reg = <0x18046000 0x600>, <0xf8105408 0x600>,
 			      <0x18046f00 0x20>;
 			reg-names = "nand", "iproc-idm", "iproc-ext";