init: add back TARGET_INIT_VENDOR_LIB for vendor_load_properties

squashed:

init: add libinit hook for devices to create device links

let devices react to device uevents e.g. for creating
links in /dev/block/by-name/ when there is no partition name
available like on raspi with MBR boot device

Change-Id: If657c2608dc5f5363fed4a987f496cd09b56816f
5 files changed