superio/serverengines/pilot: Avoid .c includes

Following the same reasoning as commit
d3043313a91dff3bc2f879ffb3b4bf23a364d711 superio/fintek/f81865f: Avoid
.c includes
Clean up the early_serial #include directives in mainboard/romstage code.

Change-Id: Ia6ed36c8517a95b651fefdd855eec0ec91d73187
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5439
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/superio/serverengines/Makefile.inc b/src/superio/serverengines/Makefile.inc
new file mode 100644
index 0000000..4ba0a24
--- /dev/null
+++ b/src/superio/serverengines/Makefile.inc
@@ -0,0 +1,20 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+subdirs-y += pilot