terminal: restructure some logging calls in grdrm

terminal: restructure some logging calls in grdrm

Multiple issues here:
 1) Don't print excessive card dumps on each resync. Disable it and make
    developers add it themselves.
 2) Ignore EINVAL on page-flips. Some cards don't support page-flips, so
    we'd print it on each frame. Maybe, at some point, the kernel will add
    support to retrieve capabilities for that. Until then, simply ignore
    it.
 3) Replace the now dropped card-dump with a short message about resyncing
    the card.