drm/i915: fixup l3 parity sysfs access check

drm/i915: fixup l3 parity sysfs access check

When l3 parity support for Haswell was enabled in

commit 3023902bba0786225a6fcb871ee83f5713fdeeac
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Tue Jul 24 20:47:32 2012 -0700

    drm/i915: Expand DPF support to Haswell

no one noticed that the patch which introduced this macro

commit 1146327a262b28da3458876d8864499948ac9c45
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Tue Jul 24 20:47:31 2012 -0700

    drm/i915: Macro to determine DPF support

missed one spot. Fix this.

Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57441
Reviewed-by: Ben Widawsky <benjamin.widawsky@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>