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/UTOO_P66_defconfig b/configs/UTOO_P66_defconfig
index dc71dde..63ddf94 100644
--- a/configs/UTOO_P66_defconfig
+++ b/configs/UTOO_P66_defconfig
@@ -25,4 +25,5 @@
 # CONFIG_CMD_FPGA is not set
 CONFIG_CMD_GPIO=y
 # CONFIG_REQUIRE_SERIAL_CONSOLE is not set
+CONFIG_SYS_NS16550=y
 CONFIG_USB_MUSB_HOST=y