[MIPS] Add CFE support to BCM47XX

Add CFE support to the BCM47XX code.  That includes querying CFE environment
variables as well as using CFE to print messages before the serial port is
initialized (early printk).
    
Signed-off-by: Aurelien Jarno <aurel32@farad.aurel32.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4863494..371434d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -55,6 +55,8 @@
 	select SSB
 	select SSB_DRIVER_MIPS
 	select GENERIC_GPIO
+	select SYS_HAS_EARLY_PRINTK
+	select CFE
 	help
 	 Support for BCM47XX based boards