drm/i915: use dev_priv for the FBC functions

Because the cool kids use dev_priv and FBC wants to be cool too.

We've been historically using struct drm_device on the FBC function
arguments, but we only really need it for intel_vgpu_active(): we can
use dev_priv everywhere else. So let's fully switch to dev_priv since
I'm getting tired of adding "struct drm_device *dev = dev_priv->dev"
everywhere.

If I get a NACK here I'll propose the opposite: convert all the
functions that currently take dev_priv to take dev.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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 5b89130..73aaea2 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1635,7 +1635,7 @@
 	intel_runtime_pm_get(dev_priv);
 	mutex_lock(&dev_priv->fbc.lock);
 
-	if (intel_fbc_enabled(dev))
+	if (intel_fbc_enabled(dev_priv))
 		seq_puts(m, "FBC enabled\n");
 	else
 		seq_printf(m, "FBC disabled: %s\n",