nb/intel/nehalem: Only enable_smbus once

This is already done in nb/intel/nehalem/romstage.c.

Change-Id: I2dc34af874ac96af31ca9ebe6a43b2805da32d18
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36039
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/northbridge/intel/nehalem/raminit.c

@@ -3766,9 +3766,6 @@ void raminit(const int s3resume, const u8 *spd_addrmap)
 
 		collect_system_info(&info);
 
-		/* Enable SMBUS. */
-		enable_smbus();
-
 		memset(&info.populated_ranks, 0, sizeof(info.populated_ranks));
 
 		info.use_ecc = 1;