Description of problem:
Before attach new device there is no check of disk type between "cdrom" and "floppy"

Version-Release number of selected component (if applicable):
libvirt-5.10.0-1.module+el8.2.0+5135+ed3b2489.x86_64
qemu-kvm-4.2.0-4.module+el8.2.0+5220+e82621dc.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a guest with floppy device:
...
   <disk type='file' device='floppy'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/fd.img'/>
      <backingStore/>
      <target dev='fda' bus='fdc'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
...

2.Prepare another xml file with cdrom type device for "attach"
# cat cdrom.img 
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/a.iso'/>
      <target dev='fda' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
 
3.Attach the new device to the guest
# virsh attach-device demo cdrom.img
Device updated successfully

Then the xml will like:
   <disk type='file' device='floppy'>          ----device type is still floppy
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/var/lib/libvirt/images/a.iso' index='13'/>
      <backingStore/>
      <target dev='fda' bus='fdc'/>
      <readonly/>
      <alias name='fdc0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>

But when we use update-device we will get error:
# virsh update-device demo cdrom.img
error：Operation not supported: cannot modify field 'device' of the disk

Actual results:
As step 3

Expected results:
Attach-device should fail when the device type is different from before and get error "Operation not supported: cannot modify field 'device' of the disk"

Additional info: