freescale-imx: new package directory

The freescale-imx directory is intended to contain all freescale
i.MXyy related packages, together with their download site and version
info

Signed-off-by: Henk Fijnvandraat <h.fijnvandraat@inter.nl.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>