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/nyan-big_defconfig b/configs/nyan-big_defconfig
index dac8d3a..f685f18 100644
--- a/configs/nyan-big_defconfig
+++ b/configs/nyan-big_defconfig
@@ -19,6 +19,7 @@
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_SPI=y
 CONFIG_SPI_FLASH=y
+CONFIG_SYS_NS16550=y
 CONFIG_TEGRA114_SPI=y
 CONFIG_TPM_TIS_INFINEON=y
 CONFIG_USB=y