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/portl2_defconfig b/configs/portl2_defconfig
index 3ff9ebb..6291730 100644
--- a/configs/portl2_defconfig
+++ b/configs/portl2_defconfig
@@ -5,3 +5,4 @@
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_SPI_FLASH=y
+CONFIG_SYS_NS16550=y