Add fallback FireHpdPulse implementation

This introduces a fallback FireHpdPulse implementation that makes calls
to the Plug and Unplug routines. This is useful for VGA support, where
there is no native HPD pulse support via a HPD line.

BUG=None
TEST=None

Change-Id: Ia356602aa15f83f36e2f8134ea85024f624dfce8
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-on: https://chromium-review.googlesource.com/539915
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
1 file changed