package/matchbox-common: move one directory higher

We usually do not have a sub-directory for a family of related
packages, so move matchbox packages one directory higher, so they
all are in packages/

Also re-order packages alphabetically.

Reported-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>