amdfam10 boards: Drop array bus_sb800

Only bus_sb800[0] is evaluated.

Change-Id: I8ae0e6facbbe302b71692cf98a0292ee7d3bdca1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/advansus/a785e-i/mptable.c

@@ -20,7 +20,6 @@
 #include <stdint.h>
 #include <cpu/amd/amdfam10_sysconf.h>
 
-extern u8 bus_sb800[6];
 extern u32 apicid_sb800;
 
 u8 intr_data[] = {