gst-fsl-plugins: bump version to 4.0.3

Also added the package hash file.

This patch is based on the Yocto equivalent:
https://github.com/Freescale/meta-fsl-arm/commit/0d2f4f8

This package has been tested using the following commands:
 # gst-launch-0.10 playbin uri=file:///root/tears_of_steel_1080p.webm


 # gst-launch-0.10  filesrc location=/root/tears_of_steel_1080p.webm ! \
   matroskademux ! vpudec ! autovideosink
 # gst-launch-0.10  filesrc location=/root/tears_of_steel_1080p.webm ! \
   matroskademux ! vpudec ! mfw_isink
 # gst-launch-0.10 imxv4l2src ! autovideosink

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>