amdfam10 boards: Add temporary pirq_router_bus variable

It's expected that further analysis shows this to
always evaluate to 0.

Change-Id: I68599b961ca3b5e3652539c5d825a00444958d1b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30644
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/include/cpu/amd/amdfam10_sysconf.h

@@ -69,4 +69,6 @@ extern struct amdfam10_sysconf_t sysconf;
 void get_bus_conf(void);
 void get_pci1234(void);
 
+extern u8 pirq_router_bus;
+
 #endif

src/northbridge/amd/amdfam10/northbridge.c

@@ -54,6 +54,7 @@
 #endif
 
 struct amdfam10_sysconf_t sysconf;
+u8 pirq_router_bus;
 
 #define FX_DEVS NODE_NUMS
 static struct device *__f0_dev[FX_DEVS];