drm/i915: Squash gen lookup through multiple indirections inside GT access

The INTEL_INFO() macro extracts the dev_private pointer from the device,
so passing in the dev_private->dev is a long winded circumlocution.

v2: rebase onto uncore
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_uncore.c

@@ -347,7 +347,7 @@ u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg, bool trace) { \
 	unsigned long irqflags; \
 	u##x val = 0; \
 	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
-	if (IS_GEN5(dev_priv->dev)) \
+	if (dev_priv->info->gen == 5) \
 		ilk_dummy_write(dev_priv); \
 	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 		if (dev_priv->uncore.forcewake_count == 0) \
@@ -378,7 +378,7 @@ void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val, bool tr
 	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 	} \
-	if (IS_GEN5(dev_priv->dev)) \
+	if (dev_priv->info->gen == 5) \
 		ilk_dummy_write(dev_priv); \
 	hsw_unclaimed_reg_clear(dev_priv, reg); \
 	__raw_i915_write##x(dev_priv, reg, val); \