drm/i915: fix wait_remaining_ms_from_jiffies

drm/i915: fix wait_remaining_ms_from_jiffies

schedule_timeout_uninterruptible() takes jiffies not ms.

v2:
- ignore the overflow issue, the practical part of that should
  be solved instead in the caller (Chris)

Note that this issue was introduced in

commit dce56b3c626fb1d533258a624d42a1a3fc17da17
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date:   Thu Dec 19 14:29:40 2013 -0200

drm/i915: save some time when waiting the eDP timings

I've accidentally merged the broken v4 version of the patch (where
Jani noticed the issue [1]) instead of the v5, which was fixed [2].

[1] http://mid.gmane.org/87fvpnkgyg.fsf@intel.com
[2] http://mid.gmane.org/1388778311-2020-1-git-send-email-przanoni@gmail.com

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Add admission of incompetence in the form of a note.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>