freescale-imx: add imx-vpu package

As of 3.10.17-1.0.0 release, VPU code is now in its own package.

Signed-off-by: Gary Bisson <bisson.gary@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[yann.morin.1998@free.fr: slightly rework the kconfig comment; fold the
 imx-vpu patches into this changeset; add one missing license file]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Hadrien Boutteville <hadrien.boutteville@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>