package/freescale-imx/firmware-imx: bump version to 8.8

package/freescale-imx/firmware-imx: bump version to 8.8

This version is aligned with 5.4.24_2.1.0 NXP Linux BSP.

License was updated from:
LA_OPT_NXP_Software_License v10 December 2019
to:
LA_OPT_NXP_Software_License v11 February 2020
which explains the change of EULA/COPYING license files.

Tested-by: Julien Olivain <julien.olivain@oss.nxp.com>
[Julien: tested on i.MX8M Mini EVK Rev A with LPDDR4]
Tested-by: Stephane Viau <stephane.viau@oss.nxp.com>
[Stephane: tested on i.MX8MQ and i.MX8MN]
Tested-by : Maeva Manuel <maeva.manuel@oss.nxp.com>
[Maeva: tested on i.MX8QM MEK rev B0 and i.MX8QXP MEK rev B0]
Signed-off-by: Maeva Manuel <maeva.manuel@oss.nxp.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>