sb/intel: Factor out early_smbus.c for ICH7 and newer

There's no need to have a copy of the file on each southbridge, since
all of them do exactly the same thing. Northbridges and a mainboard use
these functions, so we also need to add this new header to their files.

Change-Id: Id16929cb9c25b8ec3bd067bf7d7605bce1fad2c5
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
M src/mainboard/lenovo/x201/romstage.c
M src/northbridge/intel/gm45/raminit.c
M src/northbridge/intel/i945/debug.c
M src/northbridge/intel/i945/raminit.c
M src/northbridge/intel/ironlake/raminit.c
M src/northbridge/intel/pineview/raminit.c
M src/northbridge/intel/sandybridge/raminit.c
M src/northbridge/intel/x4x/raminit.c
M src/southbridge/intel/bd82x6x/Kconfig
M src/southbridge/intel/bd82x6x/Makefile.inc
D src/southbridge/intel/bd82x6x/early_smbus.c
M src/southbridge/intel/bd82x6x/pch.h
M src/southbridge/intel/common/Kconfig
M src/southbridge/intel/common/Makefile.inc
R src/southbridge/intel/common/early_smbus.c
A src/southbridge/intel/common/early_smbus.h
M src/southbridge/intel/i82801gx/Kconfig
M src/southbridge/intel/i82801gx/Makefile.inc
M src/southbridge/intel/i82801gx/i82801gx.h
M src/southbridge/intel/i82801ix/Kconfig
M src/southbridge/intel/i82801ix/Makefile.inc
D src/southbridge/intel/i82801ix/early_smbus.c
M src/southbridge/intel/i82801ix/i82801ix.h
M src/southbridge/intel/i82801jx/Kconfig
M src/southbridge/intel/i82801jx/Makefile.inc
D src/southbridge/intel/i82801jx/early_smbus.c
M src/southbridge/intel/i82801jx/i82801jx.h
M src/southbridge/intel/ibexpeak/Kconfig
M src/southbridge/intel/ibexpeak/Makefile.inc
D src/southbridge/intel/ibexpeak/early_smbus.c
M src/southbridge/intel/ibexpeak/pch.h
M src/southbridge/intel/lynxpoint/Kconfig
M src/southbridge/intel/lynxpoint/Makefile.inc
D src/southbridge/intel/lynxpoint/early_smbus.c
M src/southbridge/intel/lynxpoint/pch.h
35 files changed, 60 insertions(+), 274 deletions(-)