Rebase to 5.2.0-rc0
* Drop deprecated targets: moxie, unicore32, lm32, tilegx, ppc64abi32
* Use qemu-pr-helper units from qemu contrib/
* Drop ivshmem-tools package, upstream doesn't install it anymore
* New spice device modules
Signed-off-by: Cole Robinson <crobinso@redhat.com>