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/MPC837XEMDS_HOST_defconfig b/configs/MPC837XEMDS_HOST_defconfig
index 2e472a7..972e0f8 100644
--- a/configs/MPC837XEMDS_HOST_defconfig
+++ b/configs/MPC837XEMDS_HOST_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_MPC837XEMDS=y
 CONFIG_SYS_EXTRA_OPTIONS="PCI"
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_SYS_NS16550=y