Brings the following changes:

22f041e18df0 Extend StandardEject sequence to include LUN 1
61fdf7e9b1cc cmake: Search for libjson-c
2769852e76b5 cmake: Find libubox/blobmsg_json.h
8a47c4b6649f add TargetClass support

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>