drm/i915: Track the psr dp connector in dev_priv->psr.enabled

Trying to fish that one out through looping is a bit a locking
nightmare. So just set it and use it in the work struct.

v2:
- Don't Oops in psr_work, spotted by Rodrigo.
- Fix compile warning.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 981ca42..62ea619 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1894,7 +1894,7 @@
 
 	seq_printf(m, "Sink_Support: %s\n", yesno(dev_priv->psr.sink_support));
 	seq_printf(m, "Source_OK: %s\n", yesno(dev_priv->psr.source_ok));
-	seq_printf(m, "Enabled: %s\n", yesno(dev_priv->psr.enabled));
+	seq_printf(m, "Enabled: %s\n", yesno((bool)dev_priv->psr.enabled));
 	seq_printf(m, "Active: %s\n", yesno(dev_priv->psr.active));
 
 	enabled = HAS_PSR(dev) &&