mpc83xx: Migrate arbiter config to Kconfig

Migrate the arbiter configuration to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 9f7b3a2..8a3bb10 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -295,6 +295,7 @@
 source "arch/powerpc/cpu/mpc83xx/elbc/Kconfig"
 source "arch/powerpc/cpu/mpc83xx/hid/Kconfig"
 source "arch/powerpc/cpu/mpc83xx/sysio/Kconfig"
+source "arch/powerpc/cpu/mpc83xx/arbiter/Kconfig"
 
 menu "Legacy options"