Convert CONFIG_FSL_LBC to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_LBC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index cf93a7b..0fc4ced 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -34,6 +34,10 @@
 
 endchoice
 
+config FSL_LBC
+	def_bool y
+	depends on (MPC85xx || MPC83xx) && !FSL_IFC
+
 config HIGH_BATS
 	bool "Enable high BAT registers"
 	help