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/i12-tvbox_defconfig b/configs/i12-tvbox_defconfig
index a15a15a..ad03341 100644
--- a/configs/i12-tvbox_defconfig
+++ b/configs/i12-tvbox_defconfig
@@ -12,4 +12,5 @@
 # CONFIG_CMD_FPGA is not set
 CONFIG_CMD_GPIO=y
 CONFIG_ETH_DESIGNWARE=y
+CONFIG_SYS_NS16550=y
 CONFIG_USB_EHCI_HCD=y