[coreboot] resubmit - patch for Win Enterprises PL-6064/65 support

[ron minnich]

src/mainboard/dell/s1850/Makefile.inc

This includes the generic Makefile. I just looked at it and much to my
surprise we still have all the fiddly includes -- we tried get rid of
those last june but I guess we did not get done.

I'd sure like to see all that reduced to one or two included .lds and
.inc files. I found it hard to track.

thanks

ron