[RCAR] Change default of the kf build image

[RCAR] Change default of the kf build image

To avoid confusion between image builded with or without kingfisher support
we need to, at least, change the name of the builded image.

Bug-AGL: SPEC-3443

Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>
Change-Id: I35e4f0a5f856543ecaba6e30b62b11f4a149ea9f
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24974
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Stéphane Desneux <stephane.desneux@iot.bzh>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>