efifb,vbefb: implement vd_fini

[val_packett.cool]

Summary

This removes the pmap entry when switching away to e.g. drm fb.

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Not strictly necessary to remove the mapping — avoiding conflicts (https://github.com/freebsd/drm-kmod/issues/60) is about avoiding *touching* the memory — but it's still nice to clean up.

[tsoome]

You want to add the same to vbefb.

[val_packett.cool]

Added vbefb (not tested)

[emaste]

@tsoome will you commit?

[manu]

In D29020#655696, @emaste wrote:

@tsoome will you commit?

I planned to do it last weekend but this was delayed for this week. I'll probably do that tomorow.

[tsoome]

In D29020#655703, @manu wrote:

In D29020#655696, @emaste wrote:

@tsoome will you commit?

I planned to do it last weekend but this was delayed for this week. I'll probably do that tomorow.

ACK.

[val_packett.cool]

ping

[pstef]

sys/dev/vt/hw/efifb/efifb.c

154

style nit: double space

sys/dev/vt/hw/vbefb/vbefb.c

160

style nit: double space