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/Wexler_TAB7200_defconfig b/configs/Wexler_TAB7200_defconfig
index a01b4c1..3a007e1 100644
--- a/configs/Wexler_TAB7200_defconfig
+++ b/configs/Wexler_TAB7200_defconfig
@@ -17,5 +17,6 @@
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set
 CONFIG_CMD_GPIO=y
+CONFIG_SYS_NS16550=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_MUSB_HOST=y