The patch below fixes two problems for Kconfig on the BCM47xx platform:
- arch/mips/bcm47xx/gpio.c uses ssb_extif_* functions. Selecting
  SSB_DRIVER_EXTIF makes sure those functions are available.
- arch/mips/pci/pci.c needs, when enabled, platform specific functions,
  which are defined when SSB_PCICORE_HOSTMODE is enabled.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
        select SYS_SUPPORTS_LITTLE_ENDIAN
        select SSB
        select SSB_DRIVER_MIPS
+       select SSB_DRIVER_EXTIF
+       select SSB_PCICORE_HOSTMODE if PCI
        select GENERIC_GPIO
        select SYS_HAS_EARLY_PRINTK
        select CFE