drm/i915: enable rc6 by default

With FBC disabled by default, it should be safe to enable RC6.  So let's
give it a try.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

drivers/gpu/drm/i915/i915_drv.c

@@ -52,7 +52,7 @@ module_param_named(powersave, i915_powersave, int, 0600);
 unsigned int i915_semaphores = 1;
 module_param_named(semaphores, i915_semaphores, int, 0600);
 
-unsigned int i915_enable_rc6 = 0;
+unsigned int i915_enable_rc6 = 1;
 module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0600);
 
 unsigned int i915_enable_fbc = 0;