[coreboot] support for siemens sitemp mainboard

[Josef Kellermann]

I've compiled support for the Siemens 'sitemp' Mainboard. The board is 
similar to the AMD dbm690t.
I adapt the code from the dbm690t according to customer requirement 
specification.

I've been testing Linux as well as Windows XP booting on this board.

Added  2 patches:
0001-mainboard-siemens.patch
0002-mainboard_kconfig.patch

Signed-off-by: Josef Kellermann <seppk at arcor.de> <mailto://seppk@arcor.de>
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