northbridge/intel/pineview: Add native raminit

Does native ram init for Intel Atom D5xx 8086:a000 northbridge

Tested on Intel D510MO mainboard, board boots linux kernel

- Works fully with both dimms populated (2x2GB), memtest passes 100%
- Almost boots with only one dimm in one of the slots
  (suspect bad memory map with one dimm?)
- Reads garbage with only one dimm in other slot

Change-Id: Ibd22be2a959045e0a83aae2a3a0e877013f80711
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/12501
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/northbridge/intel/pineview/Makefile.inc

@@ -21,6 +21,7 @@ ramstage-y += northbridge.c
 ramstage-y += acpi.c
 
 romstage-y += ram_calc.c
+romstage-y += raminit.c
 romstage-y += early_init.c
 
 endif

src/northbridge/intel/pineview/raminit.h

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015  Damien Zammit <damien@zamaudio.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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef PINEVIEW_RAMINIT_H
+#define PINEVIEW_RAMINIT_H
+
+void sdram_initialize(int boot_path, const u8 *sdram_addresses);
+
+#endif /* PINEVIEW_RAMINIT_H */