[RCAR] Update rcar drivers to BSP 3.21.0 (weston8)

[RCAR] Update rcar drivers to BSP 3.21.0 (weston8)

Update new rcar drivers in setup_mm_packages.sh:
- R-Car_Gen3_Series_Evaluation_Software_Package_of_Linux_Drivers-weston8-20191021.zip
- R-Car_Gen3_Series_Evaluation_Software_Package_for_Linux-weston8-20191206.zip

Bug-AGL: SPEC-3380

Change-Id: I563eef45d99a0bb888b2d2ef11f241f77506c8ec
Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24559
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>