amdfam10: Perform major include ".c" cleanup

Previously, all romstages for this northbridge family
would compile via 1 single C file with everything
included into the romstage.c file (!)

This patch separates the build into separate .o modules
and links them accordingly.

Currently compiles and links all fam10 roms without
breaking other roms.

Both DDR2 and DDR3 have been completed

TESTED on REACTS: passes all boot tests for 2 boards
 ASUS KGPE-D16
 ASUS KFSN4-DRE

Some extra changes were required to make it compile
otherwise there were unused functions in included "c" files.
This is because I needed to exchange CIMX
for the native southbridge routines. See in particular:
 advansus/a785e-i
 asus/m5a88-v
 avalue/eax-785e

A followup patch may be required to fix the above boards.
See FIXME, XXX tags

Change-Id: Id0f9849578fd0f8b1eab83aed910902c27354426
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/17625
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineering.com>
diff --git a/src/mainboard/asus/m5a88-v/Kconfig b/src/mainboard/asus/m5a88-v/Kconfig
index 8f2ede1..9bb8965 100644
--- a/src/mainboard/asus/m5a88-v/Kconfig
+++ b/src/mainboard/asus/m5a88-v/Kconfig
@@ -7,7 +7,7 @@
 	select DIMM_REGISTERED
 	select NORTHBRIDGE_AMD_AMDFAM10
 	select SOUTHBRIDGE_AMD_RS780
-	select SOUTHBRIDGE_AMD_CIMX_SB800
+	select SOUTHBRIDGE_AMD_SB800
 	select SUPERIO_ITE_IT8721F
 	select HAVE_OPTION_TABLE
 	select HAVE_PIRQ_TABLE