soc/intel/xeon_sp: Add utils to detect domain0 and stack0

In Xeon-SP, the domain0, which is located at stack0, usually needs
special handling due to the compatible devices on it (HEPT, IO-APIC
and legacy IOs). This patch adds util function detect whether a
give domain or stack is with such a role.

TEST=intel/archercity CRB

Change-Id: I2f26b4ac54091c24c554f17964502c364288aa40
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81199
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>

src/soc/intel/xeon_sp/chip_common.c

@@ -199,7 +199,7 @@ void iio_pci_domain_read_resources(struct device *dev)
 
 	int index = 0;
 
-	if (dev->path.domain.domain == 0) {
+	if (is_domain0(dev)) {
 		/* The 0 - 0xfff IO range is not reported by the HOB but still gets decoded */
 		res = new_resource(dev, index++);
 		res->base = 0;

src/soc/intel/xeon_sp/include/soc/chip_common.h

@@ -77,4 +77,9 @@ bool is_cxl_domain(struct device *dev);
 #define is_dev_on_ubox_domain(dev) is_ubox_domain(dev_get_pci_domain(dev))
 #define is_dev_on_cxl_domain(dev) is_cxl_domain(dev_get_pci_domain(dev))
 
+#define is_domain0(dev) (dev && dev->path.type == DEVICE_PATH_DOMAIN &&\
+		dev->path.domain.domain == 0)
+#define is_dev_on_domain0(dev) (is_domain0(dev_get_pci_domain(dev)))
+#define is_stack0(socket, stack) (socket == 0 && stack == IioStack0)
+
 #endif /* _CHIP_COMMON_H_ */