Rev 1.67 of intagp (agp_i810.c) was added to deal with the problem

where stuff was bound for a software fallback while we were vt switched,
so we couldn't assume that the aperture was clear.

Turns out that the 855 at least does not like this (the !stolen bits of
the bar at least are write-only), and this caused a gpu lockup on any
suspend that used that activate handler.

So this diff fixes it in a more complete way:

Firstly revert 1.67 of agp_i810.c, secondly add a DVACT_QUIESCE handler
to inteldrm, and in it we do three things:

1) set a flag that causes any ioctl or pagefault to sleep until the flag
is cleared so that we don't end up with something doing the following
(for example:)
- bind object
- do another blocking operation in the same ioctl/fault
< suspend happens here, followed by resume>
- wake up assuming that the object is still bound and continue along our
merry way

2) Wait for all current entrypoints to finish (so that 1) is actually
effective we need to first quiesce our callers before we continue).

3) unbind everything that is in the gtt

On resume we clear the quiet flag, and everything can continue as
expected.

Behaves as expected for me on: 855 (x40 in acpi mode), gm965 (x61s) and
arrandale (x201) over multiple suspend cycles. Also tested by several on
tech.

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