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/gdppc440etx_defconfig b/configs/gdppc440etx_defconfig
index 2dfebbb..9b06cb6 100644
--- a/configs/gdppc440etx_defconfig
+++ b/configs/gdppc440etx_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_GDPPC440ETX=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_STOP_STR=" "
+CONFIG_SYS_NS16550=y