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/chromebook_link_defconfig b/configs/chromebook_link_defconfig
index d68fa41..3f77cb5 100644
--- a/configs/chromebook_link_defconfig
+++ b/configs/chromebook_link_defconfig
@@ -24,10 +24,10 @@
 CONFIG_DM_PCI=y
 CONFIG_DM_RTC=y
 CONFIG_DEBUG_UART=y
-CONFIG_DEBUG_UART_NS16550=y
 CONFIG_DEBUG_UART_BASE=0x3f8
 CONFIG_DEBUG_UART_CLOCK=1843200
 CONFIG_DEBUG_UART_BOARD_INIT=y
+CONFIG_SYS_NS16550=y
 CONFIG_TPM_TIS_LPC=y
 CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y