drm/i915: Fix cxsr_latency_table reorg

I have re-ordered some struct members in patch:

  commit 44a655ca
  Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
  Date:   Thu Oct 13 11:09:23 2016 +0100

      drm/i915: Shrink cxsr_latency_table

but that particular one is not initialized with named
initializers which broke it.

Move the bitfields back at the beginning. Space saving
is still there.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 44a655ca ("drm/i915: Shrink cxsr_latency_table")
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476453302-7580-1-git-send-email-tvrtko.ursulin@linux.intel.com