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_spi_defconfig b/configs/tseries_spi_defconfig
index 6703b17..befff36 100644
--- a/configs/tseries_spi_defconfig
+++ b/configs/tseries_spi_defconfig
@@ -17,3 +17,4 @@
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NFS is not set
 CONFIG_SPI_FLASH=y
+CONFIG_SYS_NS16550=y