drm/i915/gvt: Fix gvt scheduler interval time

drm/i915/gvt: Fix gvt scheduler interval time

BugLink: http://bugs.launchpad.net/bugs/1682130
commit 2958b9013fcbabeeba221161d0712f5259f1e15d upstream.

Fix to correctly assign 1ms for gvt scheduler interval time,
as previous code using HZ is pretty broken. And use no delay
for start gvt scheduler function.

Fixes: 4b63960ebd3f ("drm/i915/gvt: vGPU schedule policy framework")
Cc: Zhi Wang <zhi.a.wang@intel.com>
Acked-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>