trivial: debian: Don't require valgrind on more arch ports (Closes: #896148)
trivial: debian: Don't require valgrind on more arch ports (Closes: #896148)

ia64, risvc64 and x32 aren't likely to get valgrind soon, so turn off self
tests on them and remove the dependency.

vathpela/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,fwupd/fwupd,vathpela/fwupd,superm1/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,hughsie/fwupd,fwupd/fwupd