Revert "qemu: Support chardevs with ARM virt machines"
Revert "qemu: Support chardevs with ARM virt machines"

This reverts commit 70c9b44270f75bfb7a5701d81aa49380d139e8f0.

This commit breaks existing aarch64 machvirt configs with:

    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>

Which fails with:

error: Failed to start domain fedora25-aarch64
error: internal error: process exited while connecting to monitor:
2017-06-26T13:55:34.726293Z qemu-system-aarch64: -chardev pty,id=charserial0:
char device redirected to /dev/pts/5 (label charserial0)
2017-06-26T13:55:34.782121Z qemu-system-aarch64: -device
isa-serial,chardev=charserial0,id=serial0: No 'ISA' bus found for device
'isa-serial'

zippy2/libvirt,datto/libvirt,andreabolognani/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,crobinso/libvirt,eskultety/libvirt,jardasgit/libvirt,jardasgit/libvirt,zippy2/libvirt,eskultety/libvirt,andreabolognani/libvirt,libvirt/libvirt,jfehlig/libvirt,eskultety/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,crobinso/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,datto/libvirt,olafhering/libvirt,zippy2/libvirt,datto/libvirt,jardasgit/libvirt,datto/libvirt,nertpinx/libvirt,jfehlig/libvirt,datto/libvirt,nertpinx/libvirt