drm/mgag200: Fix to always set HiPri for G200e4 V2

drm/mgag200: Fix to always set HiPri for G200e4 V2

  - Changed the HiPri value for G200e4 to always be 0.
  - Added Bandwith limitation to block resolution above 1920x1200x60Hz

Signed-off-by: Mathieu Larouche <mathieu.larouche@matrox.com>
Acked-by: Dave Airlie <airlied@redhat.com>
[seanpaul removed some trailing whitespace from the patch]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/ec0f8568d7ec41904dfe593c5deccf3f062d7bd8.1497450944.git.mathieu.larouche@matrox.com
(cherry picked from commit 0cbb738108927916a659b5b0b96e386fcd7cc6e1)

Orabug: 26427049

Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>