drm/i915: Compact device info access by a small re-ordering

drm/i915: Compact device info access by a small re-ordering

More effort to align members on 4-byte boundary helps with
code size a tiny bit:

    text           data     bss     dec     hex filename
-1460454          60014    3656 1524124  17419c drivers/gpu/drm/i915/i915.ko
+1460254          60014    3656 1523924  1740d4 drivers/gpu/drm/i915/i915.ko

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170920092701.17963-3-tvrtko.ursulin@linux.intel.com