intel/block/pcie/rtd3: Also implement _PR3

Change-Id: Id7f4373989dffe8c3bc68a034f59a94d2160dd15
Signed-off-by: Jeremy Soller <jeremy@system76.com>

src/soc/intel/common/block/pcie/rtd3/rtd3.c

@@ -384,7 +384,7 @@ static void pcie_rtd3_acpi_fill_ssdt(const struct device *dev)
 	static bool mutex_created = false;
 
 	const struct soc_intel_common_block_pcie_rtd3_config *config = config_of(dev);
-	static const char *const power_res_states[] = {"_PR0"};
+	static const char *const power_res_states[] = {"_PR0", "_PR3"};
 	const struct device *parent = dev->upstream->dev;
 	const char *scope = acpi_device_path(parent);
 	const struct opregion opregion = OPREGION("PXCS", PCI_CONFIG, 0, 0xff);