device-types: qemu: add support fo riscV

qemu support riscV virtual machines, so let's permit LAVA to boot them.
Tested with a riscV kernelCI build for riscv64.

Signed-off-by: Corentin LABBE <clabbe@baylibre.com>
15 jobs for riscV in 15 minutes and 24 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed #104808
amd64
dispatcher-debian-10

00:02:15

passed #104810
amd64
dispatcher-debian-11

00:02:29

passed #104809
amd64
server-debian-10

00:02:47

passed #104811
amd64
server-debian-11

00:05:13

 
  Analyze
passed #104812
amd64-dind
bandit-sast

00:00:47

passed #104813
amd64
black

00:00:31

passed #104814
amd64
code_quality

00:00:18

passed #104815
amd64
coverage

00:06:16

59.33%
passed #104816
amd64
dockerfiles

00:00:12

passed #104818
amd64
pylint

00:02:55

passed #104817
amd64
schemas

00:00:30

 
  Build
passed #104820
amd64
debian/10

00:01:19

passed #104819
amd64
doc

00:00:35

passed #104821
amd64-dind
docker-amd64-dispatcher

00:03:29

passed #104822
amd64-dind
docker-amd64-server

00:03:52