drm/i915: Fix product names and #defines

IGD* isn't a useful name.  Replace with the codenames, as sourced from
pci.ids.

Signed-off-by: Adam Jackson <ajax@redhat.com>
[anholt: Fixed up for merge with pineview/ironlake changes]
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_opregion.c b/drivers/gpu/drm/i915/i915_opregion.c
index 313a1a1..7cc8410 100644
--- a/drivers/gpu/drm/i915/i915_opregion.c
+++ b/drivers/gpu/drm/i915/i915_opregion.c
@@ -167,7 +167,7 @@
 	if (IS_I965G(dev) && (blc_pwm_ctl2 & BLM_COMBINATION_MODE))
 		pci_write_config_dword(dev->pdev, PCI_LBPC, bclp);
 	else {
-		if (IS_IGD(dev)) {
+		if (IS_PINEVIEW(dev)) {
 			blc_pwm_ctl &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
 			max_backlight = (blc_pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK) >> 
 					BACKLIGHT_MODULATION_FREQ_SHIFT;