nb/intel/sandybridge/raminit: Do code cleanup

Simplify calculation of value.

Tested on Lenovo T520 and DDR3-1600 DIMM (RMT3170eb86e9w16).

Change-Id: I3ecd12c431b46a8d2218f33d7eb3e10de3bcd61d
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/15181
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
1 file changed