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/sheevaplug_defconfig b/configs/sheevaplug_defconfig
index 5a37eea..9b41460 100644
--- a/configs/sheevaplug_defconfig
+++ b/configs/sheevaplug_defconfig
@@ -1,11 +1,12 @@
 CONFIG_ARM=y
 CONFIG_KIRKWOOD=y
 CONFIG_TARGET_SHEEVAPLUG=y
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
+CONFIG_CMD_NAND=y
+CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
-CONFIG_HUSH_PARSER=y
 CONFIG_CMD_DHCP=y
-CONFIG_CMD_NAND=y
 CONFIG_CMD_PING=y
-CONFIG_CMD_USB=y
+CONFIG_SYS_NS16550=y