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/chromebox_panther_defconfig b/configs/chromebox_panther_defconfig
index 52336d5..8b24727 100644
--- a/configs/chromebox_panther_defconfig
+++ b/configs/chromebox_panther_defconfig
@@ -22,6 +22,7 @@
 CONFIG_SPI_FLASH=y
 CONFIG_DM_PCI=y
 CONFIG_DM_RTC=y
+CONFIG_SYS_NS16550=y
 CONFIG_TPM_TIS_LPC=y
 CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y