qdev: Change qdev_prop_pci_devfn member @name from "int32" to "str"

qdev: Change qdev_prop_pci_devfn member @name from "int32" to "str"

Properties using qdev_prop_pci_devfn initially accepted a string of
the form "DEV.FN" or "DEV" where DEV and FN are in hexadecimal.
Member @name was "pci-devfn" initially.

Commit b403298adb5 (qdev: make the non-legacy pci address property
accept an integer) changed them to additionally accept integers: bits
3..7 are DEV, and bits 0..2 are FN.  This is inaccessible externally
in device_add so far.

The commit also changed @name to "int32", and set member @legacy-name
to "pci-devfn".  Together, this kept QMP command
device-list-properties unaffected: it used @name only when
@legacy_name was null.

Commit 07d09c58dbb (qmp: Print descriptions of object properties)
quietly dumbed that down to use @name always, and the next commit
18b91a3e082q (qdev: Drop legacy_name from qdev properties) dropped
member @legacy_name.  This changed the value of @type reported by QMP
command device-list-properties from "pci-devfn" to "int32".

But "int32" is misleading: device_add actually wants QAPI type "str".
So change @name to that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250227085601.4140852-3-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>