soc/intel/common/block/lpc: Move southbridge_write_acpi_tables declaration

Move the southbridge_write_acpi_tables declaration from acpi.h to common
lpc_lib.h, as common LPC is always the caller. This removes a duplicate
declaration since all soc/intel devices use common LPC, but not all use
common ACPI. The southbridge_write_acpi_tables function is defined in acpi.c
with the other acpi functions.

Note that this would have the reverse problem if there is ever a non-common
LPC device.

Change-Id: I0590a028b11f34e423d8f0007e0653037b0849a0
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48251
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/include/soc/acpi.h

@@ -13,8 +13,6 @@
 #define PSS_LATENCY_BUSMASTER		10
 
 unsigned long acpi_madt_irq_overrides(unsigned long current);
-unsigned long southbridge_write_acpi_tables(const struct device *device,
-	unsigned long current, struct acpi_rsdp *rsdp);
 unsigned long northbridge_write_acpi_tables(const struct device *,
 	unsigned long current, struct acpi_rsdp *);