drm/i915: Fix inconsistent indentation in intel_pre_enable_lvds()

smatch complains:

	drivers/gpu/drm/i915/intel_lvds.c:187 intel_pre_enable_lvds() warn:
	inconsistent indenting
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1467470166-31717-8-git-send-email-chris@chris-wilson.co.ukReviewed-by: Matthew Auld <matthew.auld@intel.com>