Get HDMI output working.

HDMI, despite claiming to have pixel multiply support, actually doesn't
want it, at least in the way that SDVO did.  Disable it.

Also disable the NULL_PACKETS_DURING_VSYNC bit.  Despite the docs telling us
to set it, the output doesn't like it when you do that, and the BIOS doesn't
set it.

Also add a posting read to SDVOx setting.  Without it, half the X starts
wouldn't get anything on the screen.  (interestingly, it was every other
startup, not just a chance).
(cherry picked from commit 2fa9240a3b685a0c3d0e2644fc144c927b67b6b3)

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