lenovo/x60/i915.c: Use define for `BSM`

Although it builds without any further changes, including the header

	src/northbridge/intel/i945/i945.h

where `BSM` is defined, would be useful. Unfortunately that conflicts
with the already included header `southbridge/intel/bd82x6x/pch.h`,
so it is left as is.

Change-Id: I7c0a795338c34038169e082446907987364a0e88
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/5932
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
1 file changed