configs/qemu_aarch64_ebbr: add host-qemu

Add the host-qemu package to enable testing on gitlab.

Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>