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/neo_defconfig b/configs/neo_defconfig
index 1ef57ad..a500b5f 100644
--- a/configs/neo_defconfig
+++ b/configs/neo_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_NEO=y
 # CONFIG_CMD_ELF is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_SYS_NS16550=y