Convert CONFIG_NEVER_ASSERT_ODT_TO_CPU to Kconfig

This converts the following to Kconfig:
    CONFIG_NEVER_ASSERT_ODT_TO_CPU

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 563f52c..b695c7e 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -200,6 +200,9 @@
 	bool "SerDes initialization"
 	depends on !MPC83XX_SERDES
 
+config NEVER_ASSERT_ODT_TO_CPU
+	bool "Never assert ODT to internal IOs"
+
 source "board/freescale/mpc837xerdb/Kconfig"
 source "board/gdsys/mpc8308/Kconfig"