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/bcm958300k_defconfig b/configs/bcm958300k_defconfig
index df88a57..ba430e6 100644
--- a/configs/bcm958300k_defconfig
+++ b/configs/bcm958300k_defconfig
@@ -4,3 +4,4 @@
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_SYS_NS16550=y