Improved autorebuild for kernel related stuff.

Improved autorebuild for kernel related stuff.
- make modules_install in the kernel tree is no longer called
- make modules is called on every target/compile run
- kmod packages pull the kernel modules directly out of the kernel tree and have proper file depends on them

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6998 3c298f89-4303-0410-b956-a3cf2f4a3e73