sandybridge: Set all native gfx-related options in northbridge code.

In the same time remove few native gfx options which were improperly set
and only added dead code to the binary.

Change-Id: I4ed3fec03a1655ae0a779c3aa3845de273cb12e1
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: https://review.coreboot.org/13649
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins)
11 files changed