added jffs2 support

This adds jffs2 to the generated images
remove obsolete stuff

these variables have are set in the common config file
added devinit as wrapper for init

the default bootargs of the spark boxes expect devinit as init handler.
This also disables the bootlogd
using new version of libstb-hal

This is just a upgrade
fixed kernel to boot jffs2 image on flash

with the patches used previously the bootargs whipe out the jffs2 bootarguments
to boot yaffs without modification of the bootargs flags
move sh4 specific code to BSP layer

removed the sh4 specific adjustments to the BSP layer