agp: don't lock pages

AGP should not need to lock pages. They are not protecting any race
because there is no lock_page calls, only SetPageLocked.

This is causing hangs with d00806b183152af6d24f46f0c33f14162ca1262a.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/char/agp/generic.c
Simple merge

diff --cc drivers/char/agp/intel-agp.c
Simple merge

diff --cc drivers/char/agp/sgi-agp.c
Simple merge