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/tseries_nand_defconfig b/configs/tseries_nand_defconfig
index ffce135..65d514a 100644
--- a/configs/tseries_nand_defconfig
+++ b/configs/tseries_nand_defconfig
@@ -16,3 +16,4 @@
 # CONFIG_CMD_ITEST is not set
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_SYS_NS16550=y