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linux Build error due to missing dependency of BCM47XXX on EXTIF

Bug fixed by commit 2f02c15a5d9

Type	UndefinedSymbol
Config	"BCM47XX && !SSB_DRIVER_EXTIF" (2nd degree)
Fix-in	model
Location	arch/mips/

#ifdef CONFIG_SSB_DRIVER_EXTIF
int ssb_extif_gpio_in()
{
  return 0;
}
#endif

#ifdef CONFIG_BCM47XX
int bcm47xx_gpio_get_value()
{
  return ssb_extif_gpio_in();
}
#endif

int main(int argc, char** argv)
{
#ifdef CONFIG_BCM47XX
 bcm47xx_gpio_get_value();
#endif
  return 0;
}

diff --git a/simple/2f02c15.c b/simple/2f02c15.c
--- a/simple/2f02c15.c
+++ b/simple/2f02c15.c
@@ -1,3 +1,6 @@
+#ifdef CONFIG_BCM47XX
+#define CONFIG_SSB_DRIVER_EXTIF
+#endif
 
 #ifdef CONFIG_SSB_DRIVER_EXTIF
 int ssb_extif_gpio_in()