package/freescale-imx/firmware-imx: bump version to 8.6

package/freescale-imx/firmware-imx: bump version to 8.6

This package needed to be updated to be aligned with NXP BSP
5.4.3_1.0.0. It only updates the i.MX8 VPU firmware files.

The license files have changed due to:
- update to LA_OPT_NXP_Software_License v10 December 2019
- addition of Crank, EmSA and TARA Systems restrictions

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
[Thomas: extend commit log according to details provided by Gary
Bisson]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>