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/dlvision_defconfig b/configs/dlvision_defconfig
index 97bdd51..b011cb1 100644
--- a/configs/dlvision_defconfig
+++ b/configs/dlvision_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_DLVISION=y
 # CONFIG_CMD_ELF is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_SYS_NS16550=y