package/systemd-hacks: fix

* install_recursive: create necessary directories
* use cp -dpR instead of cp -a
add package/better-initramfs
package/better-initramfs: install keymap file
package/better-initramfs: patch for additional hook

post_newroot_mount after mounting /newroot/usr
package/better-initramfs: import hooks from directories
package/tlp: drop sed,awk deps

EXPERIMENTAL. busybox variants should suffice, needs to be tested
package/tlp: allow installation if BR2_INIT_NONE=y

Allow custom installation for initramfs usage etc.
update package/tlp/PKG_NOTES
add package/diskid