octeon: disable ext4 images

They're pretty large and squashfs images tend to be more useful anyway

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/octeon/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=mips64
 BOARD:=octeon
 BOARDNAME:=Cavium Networks Octeon
-FEATURES:=squashfs ext4 ramdisk pci usb
+FEATURES:=squashfs ramdisk pci usb
 CPU_TYPE:=octeon
 MAINTAINER:=John Crispin <john@phrozen.org>