nb/intel/sandybridge/gma: Use common init_igd_opregion method

Use common init_igd_opregion method.

Change-Id: Ia10a28d05b611a59f787b53f9736b3b76a19ea4a
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19908
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/northbridge/intel/sandybridge/Kconfig b/src/northbridge/intel/sandybridge/Kconfig
index b52807c..ae5ddfc 100644
--- a/src/northbridge/intel/sandybridge/Kconfig
+++ b/src/northbridge/intel/sandybridge/Kconfig
@@ -17,6 +17,7 @@
 config NORTHBRIDGE_INTEL_SANDYBRIDGE
 	bool
 	select NORTHBRIDGE_INTEL_COMMON_MRC_CACHE
+	select NORTHBRIDGE_INTEL_COMMON_GMA_OPREGION
 	select CPU_INTEL_MODEL_206AX
 	select HAVE_DEBUG_RAM_SETUP
 	select INTEL_GMA_ACPI
@@ -25,6 +26,7 @@
 config NORTHBRIDGE_INTEL_IVYBRIDGE
 	bool
 	select NORTHBRIDGE_INTEL_COMMON_MRC_CACHE
+	select NORTHBRIDGE_INTEL_COMMON_GMA_OPREGION
 	select CPU_INTEL_MODEL_306AX
 	select HAVE_DEBUG_RAM_SETUP
 	select INTEL_GMA_ACPI