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/P1023RDB_defconfig b/configs/P1023RDB_defconfig
index ab8f6bb..2478f30 100644
--- a/configs/P1023RDB_defconfig
+++ b/configs/P1023RDB_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_P1023RDB=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
+CONFIG_SYS_NS16550=y