amd: Fix unused variable warning

Comment out the id variable which is used in a commented code
block.

Change-Id: Ib002d57e5314971f0589d04b7e451ab7d7079f53
Signed-off-by: Vikram Narayanan <vikram186@gmail.com>
Reviewed-on: http://review.coreboot.org/913
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/cpu/amd/agesa/family12/model_12_init.c

@@ -62,11 +62,12 @@ static void model_12_init(device_t dev)
 
   u8 i;
   msr_t msr;
-  struct node_core_id id;
+
 #if CONFIG_LOGICAL_CPUS == 1
   u32 siblings;
 #endif
 
+//  struct node_core_id id;
 //  id = get_node_core_id(read_nb_cfg_54());  /* nb_cfg_54 can not be set */
 //  printk(BIOS_DEBUG, "nodeid = %02d, coreid = %02d\n", id.nodeid, id.coreid);