sb/intel/lynxpoint: Move `acpi_fill_fadt` to fadt.c

Other Intel southbridges do this.

Change-Id: I9b0c8be34e01b617352da4ff8ff37f4b44a4b334
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43374
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maxim Polyakov <max.senia.poliak@gmail.com>
diff --git a/src/southbridge/intel/lynxpoint/Makefile.inc b/src/southbridge/intel/lynxpoint/Makefile.inc
index e3d056d..48be615 100644
--- a/src/southbridge/intel/lynxpoint/Makefile.inc
+++ b/src/southbridge/intel/lynxpoint/Makefile.inc
@@ -6,6 +6,7 @@
 
 ramstage-y += pch.c
 ramstage-y += azalia.c
+ramstage-y += fadt.c
 ramstage-y += lpc.c
 ramstage-y += pcie.c
 ramstage-y += sata.c