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/p2371-0000_defconfig b/configs/p2371-0000_defconfig
index 07bc339..f5253bc 100644
--- a/configs/p2371-0000_defconfig
+++ b/configs/p2371-0000_defconfig
@@ -12,6 +12,7 @@
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NFS is not set
 CONFIG_SPI_FLASH=y
+CONFIG_SYS_NS16550=y
 CONFIG_TEGRA114_SPI=y
 CONFIG_USB=y
 CONFIG_DM_USB=y