northbridge/intel/x4x: Native raminit

Passes memtest86+ with either one or two sticks of 2GB ram
but memory map needs a hole at 0xa0000000 to 0xc0000000

Change-Id: Ib34d862cb48b49c054a505fffcba1c17aeb39436
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/11307
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
3 files changed