nb/intel/sandybridge: Move DMI init code

Move the DMI initialization code to northbridge folder.
Leave southbridge specific settings in bd82x6x folder and call it from
northbridge code.

Tested on Lenovo T520 (Intel Sandy Bridge).
Still boots to OS, no errors visible in dmesg.

Change-Id: Ib0b47391f3309f9ab0c3a3a8d525f38f8cca73c0
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32073
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/northbridge/intel/sandybridge/raminit.c

@@ -315,6 +315,7 @@ static void init_dram_ddr3(int min_tck, int s3resume)
 	}
 
 	early_pch_init_native();
+	early_init_dmi();
 	early_thermal_init();
 
 	/* try to find timings in MRC cache */