intel: Make the length for PIPE_CONTROL explicit.

intel: Make the length for PIPE_CONTROL explicit.

PIPE_CONTROL has variable length, depending upon generation and whether
we want to do 32-bit or 64-bit data writes.  Make it explicit, rather
than hiding a length of 4 in the #define for _3DSTATE_PIPE_CONTROL.

Generated by s/3DSTATE_PIPE_CONTROL/3DSTATE_PIPE_CONTROL | (4 - 2)/g.
This is equivalent since the #define used to have | 2 in it.  A grep
through the sources shows that all instances have been converted, so
it's safe to remove the | 2 from the #define.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Eric Anholt <eric@anholt.net>