organization: separate out gblink pieces to different folders
This will eventually allow for applications including this library
to include specific folders to only get the desired features. e.g.
only including gblink/ will just get base link interface handling,
including both gblink/ and protocols/printer/ will get the full
printer protocol support abstraction.
Signed-off-by: Kris Bahnsen <Kris@KBEmbedded.com>