drm/mgag200: Added support for the new device G200eH3

drm/mgag200: Added support for the new device G200eH3

BugLink: http://bugs.launchpad.net/bugs/1693337
- Added the new device ID
- Added new pll algorithm

Signed-off-by: Mathieu Larouche <mathieu.larouche@matrox.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit f0493e653f9679114d1dfd54ab88b54ce95576e1)
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>