ns16550: move CONFIG_SYS_NS16550 to Kconfig

Move CONFIG_SYS_NS16550 to Kconfig, and run moveconfig.py.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
diff --git a/configs/MPC8572DS_defconfig b/configs/MPC8572DS_defconfig
index 2f69b14..8b42ea3 100644
--- a/configs/MPC8572DS_defconfig
+++ b/configs/MPC8572DS_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_MPC8572DS=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
+CONFIG_SYS_NS16550=y