mpc83xx: Migrate SPCR to Kconfig

Migrate the SPCR setting 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 8a3bb10..fe20e85 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -296,6 +296,7 @@
 source "arch/powerpc/cpu/mpc83xx/hid/Kconfig"
 source "arch/powerpc/cpu/mpc83xx/sysio/Kconfig"
 source "arch/powerpc/cpu/mpc83xx/arbiter/Kconfig"
+source "arch/powerpc/cpu/mpc83xx/initreg/Kconfig"
 
 menu "Legacy options"