cns3xxx: add myself as maintainer

Signed-off-by: Koen Vandeputte <[email protected]>

target/linux/cns3xxx/Makefile

@@ -12,8 +12,8 @@ BOARDNAME:=Cavium Networks Econa CNS3xxx
 FEATURES:=squashfs fpu gpio pcie usb usbgadget
 CPU_TYPE:=mpcore
 CPU_SUBTYPE:=vfp
-MAINTAINER:=Felix Fietkau <[email protected]>
-
+MAINTAINER:=Felix Fietkau <[email protected]>, \
+	    Koen Vandeputte <[email protected]>
 KERNEL_PATCHVER:=4.14
 
 define Target/Description