drm/i915: drop WaSetupGtModeTdRowDispatch:snb

drm/i915: drop WaSetupGtModeTdRowDispatch:snb

This reverts the regressing

commit 6547fbdbfff62c99e4f7b4f985ff8b3454f33b0f
Author: Daniel Vetter <[email protected]>
Date:   Fri Dec 14 23:38:29 2012 +0100

    drm/i915: Implement WaSetupGtModeTdRowDispatch

that causes GPU hangs immediately on boot.

Reported-by: Leo Wolf <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79996
Cc: [email protected] (v3.8+)
Signed-off-by: Daniel Vetter <[email protected]>
[Jani: amended the commit message slightly.]
Signed-off-by: Jani Nikula <[email protected]>