tools/padjffs2: allow to specify extra offset

This will be useful for firmware images which are
using a custom header.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38195 3c298f89-4303-0410-b956-a3cf2f4a3e73
image: generate separate jffs2 images w/o padding

The new root.jffs2-*-raw images can be used for firmware
images with custom padding requirements.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38196 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: create firmware partition from MyLoader partition parser

This is in preparation for sysupgrade support for Compex devices.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38197 3c298f89-4303-0410-b956-a3cf2f4a3e73