vt_vga: repost only a vgapci(4) video deviceHEADmain

When vt(4) falls back to vt_vga, vga_init() passes vd_video_dev to
vga_pci_repost(), which expects a vgapci(4) device. The framebuffer
driver that set it need not provide one: drm-kmod's linux_fb passes the
parent of the DRM parent device, which is vgapci for LinuxKPI PCI
drivers but the PCI bus for virtio-gpu, whose DRM parent is the virtio
PCI transport. On x86, vga_pci_repost() then calls pci_get_class() on
the bus, which fails the accessor's KASSERT under INVARIANTS; without
INVARIANTS the class reads as 0 and the repost is skipped. Repost only
a vgapci device.

Signed-off-by:	Denis Borovikov <denis.borovikov@gmail.com>
Reviewed by:	wulf
Differential Revision:	https://reviews.freebsd.org/D60880

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