mb/gigabyte/ga-{h61m-s2pv,b75m-d3h,b75m-d3v}: Clean up CMOS files

Options that were deemed unneceesary on other code reviews have
been removed from the layout files. In addition, the checksummed
range has been extended to cover sata_mode and gfx_uma_size.

Change-Id: Id9e904f447809231806a786e39ed638f21e1bc5a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/27217
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-by: Nico Huber <nico.h@gmx.de>
5 files changed