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/am335x_boneblack_vboot_defconfig b/configs/am335x_boneblack_vboot_defconfig
index e93f6ac..283489c 100644
--- a/configs/am335x_boneblack_vboot_defconfig
+++ b/configs/am335x_boneblack_vboot_defconfig
@@ -16,3 +16,4 @@
 CONFIG_DM_MMC=y
 CONFIG_SPI_FLASH=y
 CONFIG_DM_ETH=y
+CONFIG_SYS_NS16550=y