firmware-imx: bump to version 5.4

firmware-imx: bump to version 5.4

Changelog:
- Upgrade to FW v3.1.1_r46072
- v3.1.1_r46070 plus 2 patches 391/392
- FSLARIK-391 [Decoder/H.264] VPU is always busy when decoding an
erroneous H264 bitstream
- FSLARIK-392 [Decoder/VC1] VPU outputs only 1 picture
- Change to the format of Linux coda driver firmware

This patch is based on the Yocto equivalent:
https://github.com/Freescale/meta-fsl-arm/commit/dbb8773

Implicitly tested through gstreamer as the plugin relies on it:
 # gst-launch-1.0 filesrc location=/root/tears_of_steel_1080p.webm ! \
   matroskademux ! imxvpudec ! imxipuvideosink

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>