i82801gx: Kill unused TCG and SMI1

SMI1 is being written to but never read from.

Change-Id: I82c0800713e3093eb1317b5e1f6f228771134857
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6808
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/southbridge/intel/i82801gx/smi.c

@@ -387,7 +387,5 @@ void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
 	 * after we relocated the GNVS, so this is not troublesome.
 	 */
 	*(u32 *)0x500 = (u32)gnvs;
-	*(u32 *)0x504 = (u32)tcg;
-	*(u32 *)0x508 = (u32)smi1;
 	outb(0xea, 0xb2);
 }