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/socrates_defconfig b/configs/socrates_defconfig
index 37af82e..19cc388 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -3,3 +3,4 @@
 CONFIG_TARGET_SOCRATES=y
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_SYS_NS16550=y