meta-agl-bsp: add kernel-devicetree to nogfx rcar3 images

Shift the IMAGE_INSTALL_append of the kernel-devicetree package to
agl_rcar-nogfx.inc so that it will be added to the *ulcb-nogfx images
in addition to the *uclb images.  This fixes booting the nogfx images
from SD cards created with the wic.xz image.

Bug-AGL: SPEC-3754

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: If4868326f50e45046fcce7b5d6ba43f13f746ec1
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25866
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: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
(cherry picked from commit 47464de6ae327896b2d2e5047275d933010b5eeb)
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25781