soc/amd/common: Only set write_acpi_tables if ACPI table is enabled

In ./include/device/device.h, the struct device_operations is defined
as below.
------------------------------------
   #if CONFIG(HAVE_ACPI_TABLES)
   	unsigned long (*write_acpi_tables)(const struct device *dev,
   		unsigned long start, struct acpi_rsdp *rsdp);
   	void (*acpi_fill_ssdt)(const struct device *dev);
   	void (*acpi_inject_dsdt)(const struct device *dev);
   	const char *(*acpi_name)(const struct device *dev);
   	/* Returns the optional _HID (Hardware ID) */
   	const char *(*acpi_hid)(const struct device *dev);
   #endif
------------------------------------
So we also need to add the same #if in the C source.

Change-Id: I488eceacb260ebe091495cdc3448c931cc4a1ae3
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49928
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
diff --git a/src/soc/amd/common/block/lpc/lpc.c b/src/soc/amd/common/block/lpc/lpc.c
index 8a7dc34..0be5b74 100644
--- a/src/soc/amd/common/block/lpc/lpc.c
+++ b/src/soc/amd/common/block/lpc/lpc.c
@@ -322,7 +322,9 @@
 	.read_resources = lpc_read_resources,
 	.set_resources = lpc_set_resources,
 	.enable_resources = lpc_enable_resources,
+#if CONFIG(HAVE_ACPI_TABLES)
 	.write_acpi_tables = southbridge_write_acpi_tables,
+#endif
 	.init = lpc_init,
 	.scan_bus = scan_static_bus,
 	.ops_pci = &pci_dev_ops_pci,