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/ids8313_defconfig b/configs/ids8313_defconfig
index 821c6fa..deafa38 100644
--- a/configs/ids8313_defconfig
+++ b/configs/ids8313_defconfig
@@ -8,3 +8,4 @@
 CONFIG_AUTOBOOT_PROMPT="Enter password - autoboot in %d seconds...\n"
 CONFIG_AUTOBOOT_DELAY_STR="ids"
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_SYS_NS16550=y