soc/intel/xeon_sp/acpi: Fix uncore dsdt for multiple cpus

Fix the asl to use CONFIG_MAX_CPUS  to create entries for
multiple cpu uncores. Don't add the RTxx resource entries multiple
times. The function is called for each CPUs.

Change-Id: Ia4eb9716ae4bd72fb4eb98649105be629623cbef
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47060
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/xeon_sp/acpi/iiostack.asl

@@ -69,7 +69,7 @@ MAKE_IIO_DEV(01, 10)
 MAKE_IIO_DEV(02, 20)
 MAKE_IIO_DEV(03, 28)
 
-#if MAX_SOCKET > 1
+#if (CONFIG_MAX_SOCKET > 1)
 MAKE_IIO_DEV(06, 40)
 MAKE_IIO_DEV(07, 50)
 MAKE_IIO_DEV(08, 60)

src/soc/intel/xeon_sp/cpx/soc_acpi.c

@@ -60,6 +60,10 @@ void uncore_inject_dsdt(const struct device *device)
 {
 	struct iiostack_resource stack_info = {0};
 
+	/* Only add RTxx entries once. */
+	if (device->bus->secondary != 0)
+		return;
+
 	get_iiostack_info(&stack_info);
 
 	acpigen_write_scope("\\_SB");

src/soc/intel/xeon_sp/skx/soc_acpi.c

@@ -104,6 +104,10 @@ void uncore_inject_dsdt(const struct device *device)
 	const IIO_UDS *hob = fsp_find_extension_hob_by_guid(uds_guid, &hob_size);
 	assert(hob != NULL && hob_size != 0);
 
+	/* Only add RTxx entries once. */
+	if (device->bus->secondary != 0)
+		return;
+
 	acpigen_write_scope("\\_SB");
 	for (int socket = 0; socket < hob->PlatformData.numofIIO; ++socket) {
 		IIO_RESOURCE_INSTANCE iio_resource =