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/coreboot-x86_defconfig b/configs/coreboot-x86_defconfig
index 5c4260f..05ced31 100644
--- a/configs/coreboot-x86_defconfig
+++ b/configs/coreboot-x86_defconfig
@@ -17,6 +17,7 @@
 CONFIG_E1000=y
 CONFIG_DM_PCI=y
 CONFIG_DM_RTC=y
+CONFIG_SYS_NS16550=y
 CONFIG_TPM_TIS_LPC=y
 CONFIG_USB=y
 CONFIG_DM_USB=y