Fixes compile errors with if_vio when other drivers are removed.

--- sys/dev/pv/files.pv.dist	Mon Apr  7 04:25:22 2025
+++ sys/dev/pv/files.pv	Fri May 16 19:53:57 2025
@@ -53,7 +53,7 @@
 # VirtIO
 file	dev/pv/virtio.c			virtio
 
-device	vio: ether, ifnet, ifmedia
+device	vio: ether, ifnet, ifmedia, intrmap
 attach	vio at virtio
 file	dev/pv/if_vio.c			vio