soc/intel/alderlake: Select INTEL_GMA_OPREGION_2_1

Alder Lake supports IGD Opregion version 2.1.

BUG=b:190019970
BRANCH=None

Signed-off-by: Meera Ravindranath <meera.ravindranath@intel.com>
Change-Id: I95a6f3df185003a4e38faa920f867ace0b97ab2b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56156
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/alderlake/Kconfig

@@ -32,6 +32,7 @@ config CPU_SPECIFIC_OPTIONS
 	select INTEL_CAR_NEM #TODO - Enable INTEL_CAR_NEM_ENHANCED
 	select INTEL_GMA_ACPI
 	select INTEL_GMA_ADD_VBT if RUN_FSP_GOP
+	select INTEL_GMA_OPREGION_2_1
 	select IOAPIC
 	select INTEL_TME
 	select MP_SERVICES_PPI_V2