imx-codec: rename from libfslcodec and bump version to 4.0.9

imx-codec: rename from libfslcodec and bump version to 4.0.9

Changelog:
--[aac_dec] refine the code for pure c build
  aac decoder c build need float point support, which use some
  float point function.

This patch is based on the Yocto equivalent:
https://github.com/Freescale/meta-fsl-arm/commit/4b91194

Implicitly tested through gstreamer as the 0.10 plugin relies on it:
 # gst-launch-0.10 playbin uri=file:///root/tears_of_steel_1080p.webm

Signed-off-by: Andrew Webster <awebster@arcx.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Tested-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>